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The picturesque lagoon
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on which the iconic city of Venice was built
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has always been this form of maritime powers lifeline,
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offering crucial protection from the mainland
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and easy access to the sea.
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But the very waters that were its historical ally
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also became Venice's greatest enemy
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with recurrent flooding across the vast tracks of the city.
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In a marvel of modern naval engineering
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and heavy lift technology, the Italian government
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under consortium of private enterprises
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is building a 7.3 billion Euro water barrier system
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to safeguard this romantic city of water
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for future generations.
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(upbeat music)
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(water sloshing)
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The streets of Venice flood,
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a phenomenon known here as acqua alta,
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when strong southeasterly winds
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and a high astronomical tide
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calls an unusual inflow of water into the Venetian Lagoon.
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Exceptional tides measured here at Punta della Dogana
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have occurred more frequently over the last century
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and risk catastrophically damaging the whole lagoon
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and the city itself.
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Venetians have long been accustomed
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to coping with the inconvenience of acqua alta.
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In 2003, the Italian government
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began building an ambitious feat of engineering
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to stop the devastating high tides and save the city.
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A massive surge barrier with 78 floating gates
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to close off the lagoon when flooding occurs.
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Let's say it's a problem of preservation
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of the city's monumental heritage.
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Thanks to exchanges with the environmentalist
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and to the improvement of the technologies,
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we have created the most important
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and probably the greatest environmental initiative
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in the world.
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You can't just finish part of it and then see if it works.
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We're going to have to wait until it's completely finished.
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Venice is sinking
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due to a two-fold mix of natural and man-made problems.
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Climate change has caused the Adriatic to rise.
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But Venice also suffers from shifting plate tectonics,
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meaning, the ground underneath the city is sinking.
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This problem is made worse
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by the reckless pumping of groundwater
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for use in petrochemical plants nearby.
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(soft music)
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We estimate that the sea level
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has risen by 12 to 13 centimeters.
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So the sum of rising sea levels and the thinking soil
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totals about 25 centimeters.
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So the city of Venice over the course of the last century
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has sunk approximately 25 centimeters
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with respect to the average sea level.
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In 1966, flood levels in the city
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reached a record, 1.94 meters, roughly six feet,
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causing immense damage to the city's building
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and giving birth to the Save Venice movement.
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Recognizing the need for a permanent solution,
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city authorities hatched a plan
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for the separation of the lagoon from the sea at high tide.
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The project was baptized, MOSE,
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an acronym that stands for
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Modulo Elettromeccanico Sperimentale
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or Experimental Electromechanical Module.
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In 1966, Venice flooded dramatically.
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It was the worst flood ever recorded
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and lasted longer than ever before,
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and so the Italian government
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decided that Venice had become a national problem
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and that the city had to be saved from the high waters.
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So from that moment onwards,
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a series of ideas emerged and then projects were launched
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that are now being concluded after many years
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to create a system that stops the rising waters
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outside the Venetian lagoon
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protecting the city from flooding.
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The MOSE project was all the more ambitious
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because of the geography of Venice.
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The Venetian lagoon was formed about 6,000 years ago
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as the coastal plain shifted following the last ice age.
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Today it stretches 550 square kilometers
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from the River Sila in the North
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to the Brenta in the South.
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The city of Venice and the smaller islands around it
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all together only account for 8% of the lagoon area,
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while 12% is permanently covered by open water and canals,
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and 80% is mud-flats, tidal shallows and salt marshes.
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In fact, it is one of the Mediterranean basin's
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largest wetlands.
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The lagoon is connected to the Adriatic sea
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by three large openings in the natural sand barrier.
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They are the Lido, the Malamocco,
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and the Chioggia inlets
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where the tide enters and exits twice a day.
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The seawater enters the inlets
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and spreads gradually into the lagoon.
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From the inlets, it spreads along the canals.
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It goes faster along canals but also around the sand banks
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and the deeper areas.
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And when the tide receipts, the sea level goes down,
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and the waters flow out of the lagoon inlets once again.
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During and after the fall
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of the Western Roman Empire,
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the inhabitants of the Venetian coastal plain
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fled the invading barbarians
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and came to live on the dozens of islands
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surrounded by the shadow lagoon
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for the protection it afforded.
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Over the centuries, the lagoon became a natural base
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for the great Venetian trading empire.
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The Venetians built their city by driving giant oak poles
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up to four meters into the muddy flats,
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effectively petrifying and preserving them.
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They put planks on top of these pillars
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and marble foundations on top of the planks.
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Over time, the Brenta and Sila rivers
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deposited in the lagoon blocking the navigation channels,
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and Venetians found it necessary to redirect the rivers
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so they flow directly into the sea
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instead of into the lagoon.
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Large-scale naval engineering projects
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including hydraulic pumping and the redirection of rivers
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have been underway for centuries
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and have altered the natural evolution of the lagoon,
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creating canals and a number of artificial islands.
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Battling high and low water
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has been a part of Venetian life for hundreds of years.
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The MOSE project, however, is the most complex
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and massive naval engineering project in the city's history.
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The idea that Venice could be protected from the sea
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by a series of barriers began to gain traction in the 1970s.
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Other surge barriers in London, Saint Petersburg, Russia,
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and Rotterdam in the Netherlands
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show that the concept could work,
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but actually building it in Italy
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proved far more complicated than expected.
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Like all costly big engineering projects in Italy,
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it encountered strong opposition from environmentalists,
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became vulnerable to corruption
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and fell into a web of contradictory local
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and national powers.
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When the project was first designed 30 years ago,
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it was essentially an engineering project,
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and so we approached the problem
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in a very, let's say, hard way.
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Today there are two sides to the project:
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The engineering side, but also the environmental side.
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Construction of the Venetian MOSE
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began in 2003.
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And the surge barrier is expected to be complete
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and fully functional in 2018.
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The MOSE project was tailor-made to protect Venice
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with four major barriers installed
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at the three main lagoon inlets
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that connect the lagoon to the Adriatic sea.
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The Venice surge barrier
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consists of the 78 floating steel flood gates
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arranged into four rows of various sizes,
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widths and lengths.
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They are all independently operated
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and housed in tanks anchored to the sea floor.
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Each gate lies horizontally on the sea bed when not in use.
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But when the tides over 110 centimeters are predicted,
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the barriers rise up on their hinges.
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After the threat passes,
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the air is released and the barriers can sink down again.
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The flotation forces do most of the work,
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think of them as buoyance,
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which are submerged except for the last part.
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So they are controlled with pressurized air
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inside the barrier and absorb the force of the wave,
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but the air inside the barrier compensates for it.
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Over time, the MOSE project
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morphed from being a purely engineering project
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to encompass also the recovery of lagoon wetlands
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that had been eroded over the centuries
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and the recovery and restoration of Venice's ancient Arsenal
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which became the control center of the whole project
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now run by the construction Consorzio Venezia Nuova
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or New Venice.
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The work we have done over the last few years
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has been varied:
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Land recovery, reinforcement of the coastline,
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decontamination, protection of polluted areas,
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all this to regenerate and improve the lagoon
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and the quality of its water.
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Over the course
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of a 15-year infrastructure project,
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the work has often been bogged down by political quagmires
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and kickback scandals.
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One of the most vocal opponents of the MOSE project
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is Luigi Lazzaro of Legambiente.
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This model, this Italian style
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of managing the bids and sub-bids in-house
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that determine who gets the project
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and then inflating the costs year after year
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is a direct result of the new public works law.
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Now we're up to 7 billion euros
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with the MOSE maybe being completed in 2016,
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then we'll see how much money it will cost in the future.
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It is one of the most complex
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and costly public works projects in Italian history.
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The budget of the construction
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is approximately 5.5 billion euros
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spent over 10 to 15 years for construction.
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In general terms,
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we think maintenance will be 30 to 40 million euros a year.
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But it is the MOSE surge barrier
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that is at the heart of this massive new effort
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to protect the Venice.
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The heavy lift company, Fagioli,
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was called in to move some of the key elements
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of this massive engineering operation
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together with construction company, Mantovani,
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the Venice Water Authority
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and the privately owned consortium, Venezia Nuova.
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After centuries of devastating floods,
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a plan to save Venice from the rising sea
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and the sinking city finally surfaced.
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Each of the 12,000 ton concrete housings
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had to be moved from the building site
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to the lagoon entrance.
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While the Lido and Chioggia barrier housings
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were built close to their final destination site,
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the casings for the Malamocco lagoon entrance
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were built far from where they were to be laid.
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Moving the concrete barrier housings from the building site
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to their designated place on the sea floor
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and then installing the mobile barriers
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was an Epic lifting job.
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Fagioli first had to deliver a lifting structure
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that would allow the casings built
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for the Malamocco entrance to be lowered into the water
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as the site could not be flooded like the others.
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In order to sync the casings here,
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the consortium built the largest synchrolift in the world,
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made up of 26 beams, each 57 meters long,
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activated by hydraulic winches
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that could lower the casings underwater
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so that they could in turn be lifted and transported.
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The synchrolift is a synchronized elevator
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that allows us to lower things in water,
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structures that aren't only very large in size,
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but above all, extremely heavy.
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And with this lift, we can carry caissons,
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they weigh up to 22,000 metric tons.
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The massive cross beams of the synchrolift
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were transported onto a specially designed barge
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using self-propelled modular transporters.
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They are equipped with dozens of wheels
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that can rotate individually through 90 degrees
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in order to move massive weights in any direction.
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It took three to carry each of the beams to the barge
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where they were loaded and taken to the construction site
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where they were laid side-by-side
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and attached to the massive hydraulic jacks
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that provided the lifting and lowering power.
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Fagioli was also contracted
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to move some of the concrete caissons
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from the Lido-Treporti building site.
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In order to move the massive concrete caissons,
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Fagioli engineers designed a unique tool for the job.
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They designed a catamaran structure with two river barges
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bound together with crossbeams equipped with strand jacks.
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A special wedged-shaped connection
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provided the catamaran with the necessary rigidity
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to perform the massive lift.
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The unit was designed and built at the Fagioli yards
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at Cremona on the Po river
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under the direction of Loris Giovannini.
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The port of Cremona has been a very important location
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for the MOSE project in that it had the shipyard
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where the catamaran was preassembled.
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The catamaran was constructed
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out of two existing river barges
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that were taken out of the water in the port of Cremona,
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put in the dry dock in order to modify them
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and utilize them as the catamaran.
283
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In the port of Cremona,
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the two crosshead beams were constructed.
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They would constitute the catamaran.
286
00:16:20,780 --> 00:16:22,900
Once assembled in the dry dock,
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the whole catamaran was disassembled, and piece by piece,
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barges and beams were transported to the Lido-Treporti.
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00:16:40,820 --> 00:16:43,020
For this heavy lift job,
290
00:16:43,020 --> 00:16:46,920
the catamaran needed a total of 20 strand jacks
291
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able to lift from 45 to 294 tons.
292
00:16:51,970 --> 00:16:54,693
They do the heavy lifting of the concrete caissons.
293
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Four strand jacks were used to sink the caissons.
294
00:17:04,259 --> 00:17:06,590
There were four vertical strand jacks
295
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that let us sink the caissons to the correct depth.
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Then we used the 12 L50 strand jacks
297
00:17:16,740 --> 00:17:20,063
with a capacity of 50 tons for the secondary boring.
298
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That connected the caissons to the catamaran.
299
00:17:24,964 --> 00:17:29,964
Then another four L300 strand jacks with a 300 ton capacity
300
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were used for the primary boring system
301
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which allowed the catamaran to move the caisson
302
00:17:35,040 --> 00:17:36,903
to its final resting place.
303
00:17:42,747 --> 00:17:44,810
The single most employed instrument
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in all the transportation of the 12,000 ton caissons
305
00:17:48,250 --> 00:17:51,880
of this mega project was the strand jack,
306
00:17:51,880 --> 00:17:55,670
which uses an electrically activated hydraulic pulley
307
00:17:55,670 --> 00:17:57,400
to raise massive weights
308
00:17:57,400 --> 00:18:02,148
spread evenly among the dozens of cables lifting the load.
309
00:18:02,148 --> 00:18:04,648
(soft music)
310
00:18:06,570 --> 00:18:11,570
Strand jacks were famously used to pull the 100,000 tons
311
00:18:11,680 --> 00:18:14,870
of the Costa Concordia over 12 hours
312
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from a 60 degree list to the vertical
313
00:18:17,500 --> 00:18:21,299
in the 2013 parbuckling operation.
314
00:18:21,299 --> 00:18:23,799
(soft music)
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In July of 2012, one of the massive concrete caissons
316
00:18:31,130 --> 00:18:33,590
on which the individual floating barriers
317
00:18:33,590 --> 00:18:37,260
were to be attached was ready to be moved.
318
00:18:37,260 --> 00:18:39,820
Once ready, the basin was flooded
319
00:18:39,820 --> 00:18:41,870
and the caisson started floating
320
00:18:41,870 --> 00:18:44,200
but then had to be partially sunk
321
00:18:44,200 --> 00:18:48,610
by pumping the air out of the tunnels built inside them.
322
00:18:48,610 --> 00:18:52,210
Two tugboats dragged the caissons one at a time
323
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out of the basin to a sheltered area.
324
00:18:55,928 --> 00:18:58,570
(soft music)
325
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Though the caissons were secure,
326
00:19:00,640 --> 00:19:02,540
every safety precaution was taken
327
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to make sure nothing went wrong.
328
00:19:05,540 --> 00:19:07,710
Special propylene axle lines
329
00:19:07,710 --> 00:19:10,940
were fixed to the special transport trailers
330
00:19:10,940 --> 00:19:14,190
parked along either side of the shoreline.
331
00:19:14,190 --> 00:19:17,660
They crawled along with a slowly moving caissons.
332
00:19:17,660 --> 00:19:20,893
The heaviest lift of Italian history had begun.
333
00:19:23,030 --> 00:19:26,130
Once the case since had arrived at the sheltered bay,
334
00:19:26,130 --> 00:19:28,200
the tugboats were disconnected
335
00:19:28,200 --> 00:19:30,760
and the launching operation began.
336
00:19:30,760 --> 00:19:33,763
The two tugboats boats were hooked up to the catamaran.
337
00:19:34,670 --> 00:19:35,950
The launching operations
338
00:19:35,950 --> 00:19:38,820
involved connecting the lifting points of the caissons
339
00:19:38,820 --> 00:19:42,993
to the catamaran for the so-called secondary mooring system.
340
00:19:46,950 --> 00:19:50,030
The caisson was delivered to Fagioli already floating.
341
00:19:50,030 --> 00:19:53,440
It had a dry weight of 12,500 tons.
342
00:19:53,440 --> 00:19:57,770
It was connected to the catamaran alpha inside the basin
343
00:19:57,770 --> 00:19:59,820
and then connected to the mooring system.
344
00:20:05,460 --> 00:20:07,380
Once we reached the exact point of installation,
345
00:20:07,380 --> 00:20:10,490
the caisson was ballasted until it became very heavy,
346
00:20:10,490 --> 00:20:13,030
then it was dropped down to the sea floor
347
00:20:13,030 --> 00:20:15,603
by the hydraulic pulleys or strand jacks.
348
00:20:20,970 --> 00:20:23,360
Once the structure had been connected,
349
00:20:23,360 --> 00:20:25,670
the catamaran was pushed by tugboats
350
00:20:25,670 --> 00:20:30,203
until it arrived over the underwater primary mooring system.
351
00:20:33,060 --> 00:20:36,460
Long wires called trench access lines
352
00:20:36,460 --> 00:20:39,310
showed the pathway or line to follow
353
00:20:39,310 --> 00:20:41,590
in order to get the concrete structure
354
00:20:41,590 --> 00:20:44,610
over the trench curved in the sea floor
355
00:20:44,610 --> 00:20:47,910
and reach the precise sinking point.
356
00:20:47,910 --> 00:20:51,530
Once in position, the caissons were ballasted and sank
357
00:20:51,530 --> 00:20:55,033
using strand jacks positioned onto the catamaran.
358
00:20:56,001 --> 00:20:58,501
(soft music)
359
00:21:03,980 --> 00:21:07,210
Water cushions previously positioned into the seabed
360
00:21:07,210 --> 00:21:10,380
were filled, gently taking the load of the caissons
361
00:21:10,380 --> 00:21:12,823
before they reached the bottom of the trench.
362
00:21:14,370 --> 00:21:16,330
The bags were then deflated
363
00:21:16,330 --> 00:21:18,380
allowing the placement of the caissons
364
00:21:18,380 --> 00:21:20,600
in their final position.
365
00:21:20,600 --> 00:21:24,380
Engineers used precise 3D computer models
366
00:21:24,380 --> 00:21:27,810
to place the caissons with millimetric precision
367
00:21:27,810 --> 00:21:30,080
and slide one against the other
368
00:21:30,080 --> 00:21:33,470
to form a single watertight line.
369
00:21:33,470 --> 00:21:35,190
Even the smallest error
370
00:21:35,190 --> 00:21:37,763
could mean disaster for the MOSE project.
371
00:21:41,180 --> 00:21:45,740
However, this was just the first stage in the massive move.
372
00:21:45,740 --> 00:21:47,640
Once the caissons were lowered,
373
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the floating barriers had to be attached.
374
00:21:50,220 --> 00:21:52,993
This was a massive feat of engineering.
375
00:21:57,100 --> 00:22:01,670
In 2003, the Italian government began investing billions
376
00:22:01,670 --> 00:22:04,210
into a project called MOSE,
377
00:22:04,210 --> 00:22:06,680
a massive barrier to control the tides
378
00:22:06,680 --> 00:22:10,503
flowing in and out of Venice from the Adriatic sea.
379
00:22:11,350 --> 00:22:13,660
Here at Lido-Treporti,
380
00:22:13,660 --> 00:22:17,100
the MOSE construction site rises out of the sea
381
00:22:17,100 --> 00:22:19,173
a massive gray wall of concrete.
382
00:22:20,120 --> 00:22:24,060
But what is underwater and how does it work?
383
00:22:24,060 --> 00:22:25,860
Twenty meters beneath the sea
384
00:22:25,860 --> 00:22:28,423
are a series of massive concrete caissons.
385
00:22:33,850 --> 00:22:36,740
Every barrier has its seven housing caissons,
386
00:22:36,740 --> 00:22:40,833
and 21 gates and two service tunnels, one on each flank.
387
00:22:42,690 --> 00:22:44,310
Workers who build and maintain
388
00:22:44,310 --> 00:22:45,810
these undersea tunnels
389
00:22:45,810 --> 00:22:48,023
take a lift to the bottom of the shaft.
390
00:22:49,910 --> 00:22:53,983
It is an imposing labyrinth of metal concrete and cable.
391
00:22:59,890 --> 00:23:01,460
There are two tunnels:
392
00:23:01,460 --> 00:23:02,790
one for transport,
393
00:23:02,790 --> 00:23:04,970
and another, a lateral service tunnel
394
00:23:04,970 --> 00:23:07,920
in which repairs can be carried out in a hurry
395
00:23:07,920 --> 00:23:09,193
if there is a leak.
396
00:23:10,180 --> 00:23:12,970
Watertight rooms along the side of the tunnel
397
00:23:12,970 --> 00:23:15,770
host the attachment mechanisms connected
398
00:23:15,770 --> 00:23:18,100
through the watertight female housings
399
00:23:18,100 --> 00:23:19,860
to the male part of the hinges
400
00:23:19,860 --> 00:23:24,030
on the outside of the caisson round which the barriers move
401
00:23:24,030 --> 00:23:26,633
when compressed air is pumped in to them.
402
00:23:29,180 --> 00:23:33,010
Each of the hinge rooms is flanked by a service chamber
403
00:23:33,010 --> 00:23:35,290
that allows a diver to enter the hinge room
404
00:23:35,290 --> 00:23:39,363
to carry out any emergency repairs if it is flooded.
405
00:23:40,380 --> 00:23:43,600
The watertight doors need to be checked regularly.
406
00:23:43,600 --> 00:23:46,761
They must be kept closed at all times.
407
00:23:46,761 --> 00:23:49,261
(soft music)
408
00:23:51,260 --> 00:23:53,900
Each caisson was lowered and pulled against the next
409
00:23:53,900 --> 00:23:55,900
with millimetric precision
410
00:23:55,900 --> 00:23:59,290
so as to make the whole length of the undersea tunnel
411
00:23:59,290 --> 00:24:00,883
completely watertight.
412
00:24:03,700 --> 00:24:05,790
The next phase in building the MOSE
413
00:24:05,790 --> 00:24:08,560
is positioning the mobile barriers.
414
00:24:08,560 --> 00:24:11,270
Once again, the heavy lift company, Fagioli,
415
00:24:11,270 --> 00:24:12,803
was called into play.
416
00:24:16,880 --> 00:24:20,860
In this hangar in the Maghera Port shipyard South of Venice,
417
00:24:20,860 --> 00:24:24,990
the massive yellow floodgate is finally ready to be moved.
418
00:24:24,990 --> 00:24:27,490
If you think moving a piano is hard,
419
00:24:27,490 --> 00:24:31,850
imagine this 210 ton steel box.
420
00:24:31,850 --> 00:24:35,130
The whole process of moving the barrier out to sea
421
00:24:35,130 --> 00:24:37,133
would take three full days.
422
00:24:38,290 --> 00:24:42,720
Fagioli uses a special heavy lift transport vehicle
423
00:24:42,720 --> 00:24:46,570
to slowly roll it out onto the awaiting barge.
424
00:24:46,570 --> 00:24:51,023
It is a tedious and dangerous process to move such a beast.
425
00:24:52,860 --> 00:24:57,860
Finally at dusk the barge transport it at a snail's pace
426
00:24:58,290 --> 00:25:01,990
passing by San Marco after nightfall.
427
00:25:01,990 --> 00:25:06,200
A brief glimpse of the very city it is destined to protect.
428
00:25:06,200 --> 00:25:09,800
In order to do the final most delicate phase of installation
429
00:25:09,800 --> 00:25:13,376
at daylight, the crew docks for the night.
430
00:25:13,376 --> 00:25:15,876
(soft music)
431
00:25:18,740 --> 00:25:21,400
Dawn rises over Venice.
432
00:25:21,400 --> 00:25:23,950
The city of water is slowly wakes
433
00:25:23,950 --> 00:25:26,720
doing its daily business by boat.
434
00:25:26,720 --> 00:25:30,920
The barge with the great yellow gate heads out to sea
435
00:25:30,920 --> 00:25:32,903
to its final resting place.
436
00:25:35,850 --> 00:25:37,610
After we lowered the seven caissons,
437
00:25:37,610 --> 00:25:40,890
Fagioli was also involved in the laying and installation
438
00:25:40,890 --> 00:25:42,860
of the flood gates.
439
00:25:42,860 --> 00:25:45,033
To do this, we utilized the scaffolding structure
440
00:25:45,033 --> 00:25:47,590
that was constructed of trellis towers and beams
441
00:25:47,590 --> 00:25:48,943
connected to the towers.
442
00:25:52,370 --> 00:25:53,740
The tailor-made system
443
00:25:53,740 --> 00:25:56,440
included four-tower structure
444
00:25:56,440 --> 00:25:58,950
with two crosshead beams on top
445
00:25:58,950 --> 00:26:01,910
each equipped with four strand jacks
446
00:26:01,910 --> 00:26:06,370
necessary to lower this gigantic 210 ton barrier
447
00:26:06,370 --> 00:26:07,443
into the water.
448
00:26:10,670 --> 00:26:13,880
The support structure was called the fishing beam
449
00:26:13,880 --> 00:26:16,340
as it would be used to hook the mobile barrier
450
00:26:16,340 --> 00:26:20,410
with 14 by 14 axle lines.
451
00:26:20,410 --> 00:26:23,523
The axle lines had to be perfectly constructed.
452
00:26:29,370 --> 00:26:30,880
When the structures were ready,
453
00:26:30,880 --> 00:26:34,180
a large barge equipped with four sets of gantries
454
00:26:34,180 --> 00:26:36,060
was maneuvered into position
455
00:26:36,060 --> 00:26:39,140
and then tower legs connected to a bottom frame
456
00:26:39,140 --> 00:26:42,360
were joined to the four tower sections.
457
00:26:42,360 --> 00:26:44,660
This was a delicate stage.
458
00:26:44,660 --> 00:26:48,020
Every connection had to be precise to the millimeter.
459
00:26:48,020 --> 00:26:51,550
Workers monitored every parameter using radar,
460
00:26:51,550 --> 00:26:54,653
adjusting the cables and hydraulic pressure as needed.
461
00:27:04,060 --> 00:27:05,580
The barge with the flood gates on board
462
00:27:05,580 --> 00:27:08,900
was transported to the Lido-Treporti inlet,
463
00:27:08,900 --> 00:27:11,850
and there it was floated under the force of strand jacks
464
00:27:11,850 --> 00:27:13,543
mounted on the launching links.
465
00:27:14,413 --> 00:27:15,860
The weight of the lifted flood gate
466
00:27:15,860 --> 00:27:18,333
is almost 250 metric tons.
467
00:27:19,669 --> 00:27:21,350
The strand jacks allowed the flood gates
468
00:27:21,350 --> 00:27:22,830
to be lifted from the barge
469
00:27:22,830 --> 00:27:25,973
and lowered onto the caisson on with millimetric precision.
470
00:27:30,080 --> 00:27:32,190
Once the caissons had been laid,
471
00:27:32,190 --> 00:27:34,180
the barges loaded with the barrier
472
00:27:34,180 --> 00:27:37,430
were moved directly under the launching structure
473
00:27:37,430 --> 00:27:40,220
so the fishing beam could hook the barrier.
474
00:27:40,220 --> 00:27:43,290
After this, the area was cleared from the barge
475
00:27:43,290 --> 00:27:45,430
and the barrier was lowered into the water
476
00:27:45,430 --> 00:27:47,910
using the strand jacks.
477
00:27:47,910 --> 00:27:51,090
Then the mobile barrier was freed from the support structure
478
00:27:51,090 --> 00:27:52,483
and fixed to the caisson.
479
00:27:53,780 --> 00:27:57,090
Any misstep could send a 200 ton gate
480
00:27:57,090 --> 00:27:58,483
to the bottom of the sea.
481
00:28:01,520 --> 00:28:03,590
Finally, the barge came back
482
00:28:03,590 --> 00:28:05,950
to load the launching gantry system
483
00:28:05,950 --> 00:28:08,160
and repeat the whole operation
484
00:28:08,160 --> 00:28:10,530
with the other three barriers.
485
00:28:10,530 --> 00:28:14,023
This will be done 78 times.
486
00:28:17,470 --> 00:28:19,380
This is the old Arsenal,
487
00:28:19,380 --> 00:28:22,493
ground zero of the fight to save Venice from sinking.
488
00:28:23,340 --> 00:28:26,610
Once the former shipyard of the Republic of Venice,
489
00:28:26,610 --> 00:28:28,900
today it is reclaiming its place
490
00:28:28,900 --> 00:28:30,963
as the power center of the city.
491
00:28:32,350 --> 00:28:33,740
Here in the main command
492
00:28:33,740 --> 00:28:36,310
and control station of the MOSE project,
493
00:28:36,310 --> 00:28:37,960
engineer Hermes Redi
494
00:28:37,960 --> 00:28:40,510
is in charge of managing the MOSE's reaction
495
00:28:40,510 --> 00:28:44,493
to the combination of high tides and adverse winds.
496
00:28:48,250 --> 00:28:49,380
As we've said earlier,
497
00:28:49,380 --> 00:28:53,070
the floods are caused by a combination of several events:
498
00:28:53,070 --> 00:28:55,360
One is the normal tide,
499
00:28:55,360 --> 00:28:58,130
the other is the southeasterly wind
500
00:28:58,130 --> 00:29:01,370
which pushes the water towards the upper Adriatic,
501
00:29:01,370 --> 00:29:03,610
and so, against the lagoon.
502
00:29:03,610 --> 00:29:06,120
And lastly, there is a standing wave
503
00:29:06,120 --> 00:29:08,393
which contributes to rising waters.
504
00:29:10,510 --> 00:29:11,900
He works hand in hand
505
00:29:11,900 --> 00:29:15,350
with the engineers and technicians of the city tide center
506
00:29:15,350 --> 00:29:18,630
to analyze the meteorological and tidal data
507
00:29:18,630 --> 00:29:21,010
coming into the control room.
508
00:29:21,010 --> 00:29:23,510
It is here where the crucial decision is made
509
00:29:23,510 --> 00:29:28,113
to close or open the 78 gates that make up the barrier.
510
00:29:30,412 --> 00:29:31,650
The parameters of the screen
511
00:29:31,650 --> 00:29:33,320
that you see on the upper left
512
00:29:33,320 --> 00:29:36,270
are the monitors that give us the actual position
513
00:29:36,270 --> 00:29:40,640
of every barrier, its position and its state
514
00:29:40,640 --> 00:29:42,333
should need to activate them.
515
00:29:44,970 --> 00:29:47,993
The central part is dedicated to the weather forecast.
516
00:29:51,830 --> 00:29:53,150
All the other screens
517
00:29:53,150 --> 00:29:56,100
give us information about the lagoon surroundings,
518
00:29:56,100 --> 00:29:59,010
the Mediterranean and the Adriatic sea,
519
00:29:59,010 --> 00:30:01,880
all the data near our area
520
00:30:01,880 --> 00:30:04,230
that allows us to have a clear picture
521
00:30:04,230 --> 00:30:05,830
of the meteorological situation.
522
00:30:14,070 --> 00:30:15,400
There are many parameters
523
00:30:15,400 --> 00:30:18,790
that determine exactly how many gates are opened,
524
00:30:18,790 --> 00:30:20,773
where, and in what order.
525
00:30:22,700 --> 00:30:26,270
We can see normal tides, high tides, very high tides,
526
00:30:26,270 --> 00:30:30,013
and we can react to each individual situation differently.
527
00:30:33,040 --> 00:30:35,240
Today, science and technology
528
00:30:35,240 --> 00:30:38,770
allow for the forecasting of when flooding will happen,
529
00:30:38,770 --> 00:30:40,283
but there is a deadline.
530
00:30:49,060 --> 00:30:51,520
We are able to predict several days in advance
531
00:30:51,520 --> 00:30:53,750
when a flood tide will occur
532
00:30:53,750 --> 00:30:57,350
and to forecast the tides quite accurately.
533
00:30:57,350 --> 00:31:01,230
But obviously as we get closer to the day of the flood tide,
534
00:31:01,230 --> 00:31:03,863
our ability to forecast what will happen improves.
535
00:31:05,060 --> 00:31:07,270
So, therefore, the real moment to decide
536
00:31:07,270 --> 00:31:11,180
whether or not to close the lagoon with the flood barriers
537
00:31:11,180 --> 00:31:14,500
happens about three hours before the event,
538
00:31:14,500 --> 00:31:18,640
because at that time we can determine with total certainty
539
00:31:18,640 --> 00:31:19,893
what is about to happen.
540
00:31:27,600 --> 00:31:29,650
Multiple meteorological factors
541
00:31:29,650 --> 00:31:31,093
must be calculated.
542
00:31:32,180 --> 00:31:34,740
The decision was made to use the MOSE
543
00:31:34,740 --> 00:31:37,900
only when the tide is at 110 centimeters
544
00:31:37,900 --> 00:31:40,133
above average or higher.
545
00:31:41,290 --> 00:31:44,190
Under this scenario, flooding will still occur.
546
00:31:44,190 --> 00:31:46,240
Using various simulations,
547
00:31:46,240 --> 00:31:49,460
Venice authorities are able to determine with precision
548
00:31:49,460 --> 00:31:52,920
exactly what impact floodwaters of different levels
549
00:31:52,920 --> 00:31:54,603
will have on their city.
550
00:31:55,920 --> 00:31:57,360
Venice is underwater
551
00:31:57,360 --> 00:31:59,320
and have a very small number of places
552
00:31:59,320 --> 00:32:01,790
when the sea rises 80 centimeters
553
00:32:01,790 --> 00:32:03,570
above the average sea level.
554
00:32:03,570 --> 00:32:06,840
But the ares subject to this flooding, as you can see,
555
00:32:06,840 --> 00:32:09,220
are the most famous areas of the city.
556
00:32:09,220 --> 00:32:11,780
St. Mark's Square is the first to flood,
557
00:32:11,780 --> 00:32:14,923
and Rialto immediately afterwards.
558
00:32:16,050 --> 00:32:17,690
But when the water level rises
559
00:32:17,690 --> 00:32:21,440
to 100 centimeters, one meter above average,
560
00:32:21,440 --> 00:32:24,500
St. Mark's square is completely underwater
561
00:32:24,500 --> 00:32:28,510
and some smaller streets begin to have some problems.
562
00:32:28,510 --> 00:32:30,760
At 110 centimeters,
563
00:32:30,760 --> 00:32:33,120
the famous rubber boots become a necessity
564
00:32:33,120 --> 00:32:34,453
to get around the city.
565
00:32:37,840 --> 00:32:42,070
At 130 centimeters, the city isn't completely flooded
566
00:32:42,070 --> 00:32:45,290
but it is certainly completely impacted
567
00:32:45,290 --> 00:32:48,570
which means that not only the ground floors
568
00:32:48,570 --> 00:32:50,817
and not only the shops are flooded,
569
00:32:50,817 --> 00:32:53,360
but the store rooms can't be used
570
00:32:53,360 --> 00:32:55,643
and people can't get around freely.
571
00:32:56,577 --> 00:32:58,870
At 140 centimeters,
572
00:32:58,870 --> 00:33:01,720
rubber boots are no longer any help
573
00:33:01,720 --> 00:33:05,400
and the city becomes extremely difficult to navigate.
574
00:33:05,400 --> 00:33:09,670
But it is the Epic flood levels like that of 1966
575
00:33:09,670 --> 00:33:11,093
that are the biggest worry.
576
00:33:14,830 --> 00:33:16,950
Basically, in that situation,
577
00:33:16,950 --> 00:33:19,403
Venice is completely underwater.
578
00:33:20,520 --> 00:33:22,870
Once the MOSE has been activated,
579
00:33:22,870 --> 00:33:26,010
the 78 single barriers emerge from the seabed
580
00:33:26,010 --> 00:33:27,710
in groups of four,
581
00:33:27,710 --> 00:33:31,623
effectively creating a wall between the lagoon and the sea.
582
00:33:34,800 --> 00:33:37,690
A control system keeps the inclination of the gates
583
00:33:37,690 --> 00:33:40,690
when closed at approximately 45 degrees,
584
00:33:40,690 --> 00:33:43,623
constantly adjusting the water inside.
585
00:33:45,200 --> 00:33:47,290
When it is time to open the barrier,
586
00:33:47,290 --> 00:33:49,120
the gates are filled with water,
587
00:33:49,120 --> 00:33:51,680
a process called ballasting.
588
00:33:51,680 --> 00:33:54,530
They slowly come to rest flush with the seabed
589
00:33:54,530 --> 00:33:56,033
invisible from above.
590
00:33:58,490 --> 00:34:01,430
Massive hinges that weigh 42 tons
591
00:34:01,430 --> 00:34:03,810
keep the gates attached to their bases.
592
00:34:03,810 --> 00:34:07,050
There are small gaps, just a few centimeters wide,
593
00:34:07,050 --> 00:34:09,180
which allow a little water through,
594
00:34:09,180 --> 00:34:12,210
but more importantly, allow the gates to move
595
00:34:12,210 --> 00:34:14,733
and rotate on their hinges as necessary.
596
00:34:15,860 --> 00:34:20,860
In October of 2013, the first test was conducted on the MOSE
597
00:34:20,870 --> 00:34:23,873
and the gates were raised ceremoniously out of the sea.
598
00:34:28,780 --> 00:34:30,230
The precise data is boring,
599
00:34:30,230 --> 00:34:33,110
but I can tell you that just by closing half of the inlet,
600
00:34:33,110 --> 00:34:35,420
you could definitely see a lowering of the water level
601
00:34:35,420 --> 00:34:36,600
inside the lagoon.
602
00:34:36,600 --> 00:34:39,543
So the MOSE works, the tide was slow.
603
00:34:45,590 --> 00:34:47,960
However, there is more to the MOSE
604
00:34:47,960 --> 00:34:50,650
than simply massive engineering.
605
00:34:50,650 --> 00:34:53,910
Over the years, despite the scandals attached to it,
606
00:34:53,910 --> 00:34:56,990
the MOSE has contributed to restoring other areas
607
00:34:56,990 --> 00:34:58,600
of the Venetian lagoon,
608
00:34:58,600 --> 00:35:01,543
but even those efforts are not without controversy.
609
00:35:05,260 --> 00:35:06,610
In an effort to preserve
610
00:35:06,610 --> 00:35:09,660
the uncontaminated natural environment,
611
00:35:09,660 --> 00:35:12,700
environmental groups often oppose big civil works
612
00:35:12,700 --> 00:35:15,610
like the Venetian MOSE barriers.
613
00:35:15,610 --> 00:35:17,350
In this case, however,
614
00:35:17,350 --> 00:35:21,050
the ecosystem in question is far from natural.
615
00:35:21,050 --> 00:35:23,580
Sediments carried by the many inland rivers
616
00:35:23,580 --> 00:35:26,890
originated from the lagoon itself in ancient times
617
00:35:26,890 --> 00:35:30,690
by sinking and consolidating below sea level.
618
00:35:30,690 --> 00:35:35,490
For the MOSE, new concrete walls and embankments were built,
619
00:35:35,490 --> 00:35:38,520
and even a brand new artificial island was created
620
00:35:38,520 --> 00:35:40,800
at the Northern most Lido inlet
621
00:35:40,800 --> 00:35:44,593
to host all the service buildings that control the barriers:
622
00:35:45,610 --> 00:35:48,970
On one side of the island is a lock system,
623
00:35:48,970 --> 00:35:51,960
a deep canal for tankers and cruise ships,
624
00:35:51,960 --> 00:35:55,333
and on the other side is a shallower canal leading North.
625
00:35:56,680 --> 00:35:58,830
However, not everyone agrees
626
00:35:58,830 --> 00:36:02,800
that the lagoons should be open to large ships at all.
627
00:36:02,800 --> 00:36:06,100
In Italy, there have already been disasters associated
628
00:36:06,100 --> 00:36:08,600
with large naval vessels.
629
00:36:08,600 --> 00:36:10,670
If one of these ships were to sink
630
00:36:10,670 --> 00:36:12,700
in the lagoon close to Venice,
631
00:36:12,700 --> 00:36:15,890
it would be catastrophic both for the environment
632
00:36:15,890 --> 00:36:17,890
and the residents alike.
633
00:36:17,890 --> 00:36:19,440
It has made the city slave
634
00:36:19,440 --> 00:36:21,600
to the passing of these gigantic ships,
635
00:36:21,600 --> 00:36:23,560
ships that could very possibly create
636
00:36:23,560 --> 00:36:25,280
a legitimate threat of accident,
637
00:36:25,280 --> 00:36:27,650
accidents like the ones that have unfortunately happened
638
00:36:27,650 --> 00:36:29,610
in this country like on the Island of Giglio
639
00:36:29,610 --> 00:36:32,080
with the Costa Concordia and the Port of Genoa,
640
00:36:32,080 --> 00:36:34,360
two extremely grave incidents
641
00:36:34,360 --> 00:36:36,193
that have created terrible damage.
642
00:36:37,450 --> 00:36:39,430
If MOSE is to be successful,
643
00:36:39,430 --> 00:36:41,690
it needs to be complimented by projects
644
00:36:41,690 --> 00:36:44,920
that we restore the lagoon's natural structure
645
00:36:44,920 --> 00:36:47,123
and build up its natural defenses.
646
00:36:49,200 --> 00:36:51,530
The part of the project that concerns the lagoon
647
00:36:51,530 --> 00:36:54,300
is one of the most urgent aspects of the work
648
00:36:54,300 --> 00:36:57,290
because it is necessary for environmental restoration
649
00:36:57,290 --> 00:37:02,000
of the deteriorated areas of the lagoon, but also the shore.
650
00:37:02,000 --> 00:37:04,880
The moment in which the flood gates prevent the tide waters
651
00:37:04,880 --> 00:37:07,350
from entering the lagoon from the sea,
652
00:37:07,350 --> 00:37:10,590
the sea will spread out back along the shore
653
00:37:10,590 --> 00:37:13,653
and so we had to reinforce the shore for this reason.
654
00:37:18,530 --> 00:37:19,620
Some of these measures
655
00:37:19,620 --> 00:37:23,950
include improving water quality by dredging the canals,
656
00:37:23,950 --> 00:37:27,870
which improves the water exchange in the inner lagoon areas,
657
00:37:27,870 --> 00:37:31,410
securing runoff from dumps and industrial areas,
658
00:37:31,410 --> 00:37:33,060
reinforcing the seawalls
659
00:37:33,060 --> 00:37:35,810
surrounding Venice's Island and canal banks
660
00:37:35,810 --> 00:37:39,543
and restoring thousands of kilometers of salt marshes.
661
00:37:41,990 --> 00:37:45,160
Polluted sediment was removed from canals,
662
00:37:45,160 --> 00:37:47,130
but where was it taken?
663
00:37:47,130 --> 00:37:50,330
There is concern due to some of the corruption scandals
664
00:37:50,330 --> 00:37:51,800
surrounding the project
665
00:37:51,800 --> 00:37:54,500
that the mud polluted by heavy metals
666
00:37:54,500 --> 00:37:57,450
may not have been properly disposed of.
667
00:37:57,450 --> 00:38:01,100
And what about the 49 kilometers of new beach,
668
00:38:01,100 --> 00:38:04,283
where did it come from and who will manage it?
669
00:38:06,720 --> 00:38:09,580
There is a risk here, just like in other places,
670
00:38:09,580 --> 00:38:12,040
from the excavation that brings in in soil
671
00:38:12,040 --> 00:38:13,720
from the Southern part of the lagoon
672
00:38:13,720 --> 00:38:17,310
which is obviously polluted and has been since the '60s
673
00:38:17,310 --> 00:38:19,910
by petrochemicals deposited in the seabed
674
00:38:19,910 --> 00:38:21,813
from the Marghera industrial area.
675
00:38:24,270 --> 00:38:27,070
Another concern is the impact MOSE closures
676
00:38:27,070 --> 00:38:29,313
might have on the lagoon water quality.
677
00:38:30,770 --> 00:38:33,040
It is the sea itself that is responsible
678
00:38:33,040 --> 00:38:35,700
for keeping the lagoon waters clean
679
00:38:35,700 --> 00:38:37,750
since there is no sewage system
680
00:38:37,750 --> 00:38:40,423
and black water is released into the lagoon.
681
00:38:41,290 --> 00:38:44,760
Some worry that closing the lagoon more frequently
682
00:38:44,760 --> 00:38:46,360
could tip this delicate balance.
683
00:38:47,890 --> 00:38:49,740
It's the job of the sea and the tides
684
00:38:49,740 --> 00:38:51,698
to clean up the lagoon,
685
00:38:51,698 --> 00:38:52,687
and they come into the lagoon
686
00:38:52,687 --> 00:38:55,250
and they leave the lagoon twice a day.
687
00:38:55,250 --> 00:38:57,890
Clean water comes in, picks up the waste
688
00:38:57,890 --> 00:39:01,090
and takes it back out into the open sea.
689
00:39:01,090 --> 00:39:02,870
Experts predict that sea levels
690
00:39:02,870 --> 00:39:06,070
could rise between 25 and 50 centimeters
691
00:39:06,070 --> 00:39:09,210
between now and the end of the century.
692
00:39:09,210 --> 00:39:13,380
At the same time, Venice is sinking one millimeter annually.
693
00:39:13,380 --> 00:39:15,120
The more frequent the floods,
694
00:39:15,120 --> 00:39:17,843
the more often MOSE must be used.
695
00:39:20,040 --> 00:39:23,050
The frequency of the flooding could increase significantly
696
00:39:23,050 --> 00:39:25,700
between now and the end of the century.
697
00:39:25,700 --> 00:39:27,750
So the need to close the MOSE barrier
698
00:39:27,750 --> 00:39:30,330
could increase from the present five times a year
699
00:39:30,330 --> 00:39:35,330
to up to 100, or 150 times a year, or even 200 times.
700
00:39:35,520 --> 00:39:37,350
And closing the barrier so often
701
00:39:37,350 --> 00:39:38,320
could have an impact
702
00:39:38,320 --> 00:39:40,237
on the quality of the waters of the lagoon
703
00:39:40,237 --> 00:39:41,533
and the city itself.
704
00:39:48,380 --> 00:39:50,240
University of Padua professors
705
00:39:50,240 --> 00:39:53,223
are proposing a companion solution to the MOSE,
706
00:39:54,370 --> 00:39:56,350
an audacious plan to raise Venice
707
00:39:56,350 --> 00:39:58,990
by pumping water into a soil and rock layer
708
00:39:58,990 --> 00:40:00,173
beneath the city.
709
00:40:01,240 --> 00:40:05,110
Our proposal is to raise the city by taking seawater
710
00:40:05,110 --> 00:40:08,670
and building wells 700 to 800 meters deep,
711
00:40:08,670 --> 00:40:11,883
and then pumping the water into the rocks at that depth.
712
00:40:13,010 --> 00:40:14,650
Venice will rise.
713
00:40:14,650 --> 00:40:17,360
We have calculated that over 10 years it could rise
714
00:40:17,360 --> 00:40:21,733
as much as 25 to 30 centimeters very gradually.
715
00:40:24,400 --> 00:40:26,030
Critics say the MOSE project
716
00:40:26,030 --> 00:40:27,370
may go down in history
717
00:40:27,370 --> 00:40:30,790
as little more than a concrete icon of corruption and waste
718
00:40:30,790 --> 00:40:33,253
if it's unable to protect Venice.
719
00:40:37,660 --> 00:40:39,820
It doesn't give any guarantees to the city
720
00:40:39,820 --> 00:40:40,830
that it won't flood
721
00:40:40,830 --> 00:40:43,090
because with a meter or a little over a meter
722
00:40:43,090 --> 00:40:45,550
of water washing up here in Piazza San Marco,
723
00:40:45,550 --> 00:40:47,600
the city already has problems.
724
00:40:47,600 --> 00:40:49,840
And truth, this won't stop.
725
00:40:49,840 --> 00:40:52,680
Either way, MOSE is here to stay.
726
00:40:52,680 --> 00:40:55,200
While MOSE officials say corruption scandals
727
00:40:55,200 --> 00:40:58,250
were reprehensible, that does not change the fact
728
00:40:58,250 --> 00:41:01,080
that MOSE is a naval engineering feat
729
00:41:01,080 --> 00:41:02,833
of incredible proportions.
730
00:41:05,360 --> 00:41:06,710
The work, in my opinion,
731
00:41:06,710 --> 00:41:10,730
is of extraordinary seriousness and quality.
732
00:41:10,730 --> 00:41:13,600
You have to think that for the caissons
733
00:41:13,600 --> 00:41:17,370
that are 60 by 40 by 28 structures,
734
00:41:17,370 --> 00:41:21,450
we have tolerances of less than one centimeter.
735
00:41:21,450 --> 00:41:22,610
In the last year,
736
00:41:22,610 --> 00:41:27,610
we put down 18 of these caissons one every 15 days
737
00:41:27,610 --> 00:41:30,150
without airing by one second
738
00:41:30,150 --> 00:41:32,473
or one centimeter from our plan.
739
00:41:34,320 --> 00:41:36,100
The MOSE construction is permanent
740
00:41:36,100 --> 00:41:38,270
together with all its accessory parts,
741
00:41:38,270 --> 00:41:39,323
and we'll have to live with it
742
00:41:39,323 --> 00:41:41,773
even if it's unable to respond to climate change,
743
00:41:43,050 --> 00:41:44,750
which it seems is about to happen.
744
00:41:52,070 --> 00:41:53,860
We're all waiting in anticipation,
745
00:41:53,860 --> 00:41:58,223
it could be 2016, 2017, 2018,
746
00:41:59,070 --> 00:42:00,200
waiting for the moment
747
00:42:00,200 --> 00:42:02,270
when we'll know for sure if it really works
748
00:42:02,270 --> 00:42:04,940
so we can test if the project will be able to keep
749
00:42:04,940 --> 00:42:06,990
a significant amount of the flooding out.
750
00:42:11,600 --> 00:42:14,220
After it had been pushed back several times
751
00:42:14,220 --> 00:42:18,120
due to the ongoing public works investigation underway,
752
00:42:18,120 --> 00:42:19,710
the Consortium of New Venice
753
00:42:19,710 --> 00:42:23,510
has determined a new June, 2018 date
754
00:42:23,510 --> 00:42:26,143
for completion of the MOSE project.
755
00:42:31,440 --> 00:42:35,040
The whole project is about 87% constructed.
756
00:42:35,040 --> 00:42:37,660
It's missing the last three rows of floodgates
757
00:42:37,660 --> 00:42:40,763
that they'll need to install by the end of 2015.
758
00:42:44,760 --> 00:42:46,280
Although there is some uncertainty
759
00:42:46,280 --> 00:42:49,980
about how effectively MOSE will protect the city of Venice,
760
00:42:49,980 --> 00:42:52,710
7 billion euros have been spent,
761
00:42:52,710 --> 00:42:56,160
and the project is currently the best hope the city has
762
00:42:56,160 --> 00:42:57,610
of not being swallowed up
763
00:42:57,610 --> 00:43:00,453
by the very lagoon to which it owes its fame.
764
00:43:01,360 --> 00:43:03,470
Without doubt, the MOSE project
765
00:43:03,470 --> 00:43:05,440
has been a marvel of engineering
766
00:43:05,440 --> 00:43:09,400
that has utilized the toughest machines and technologies
767
00:43:09,400 --> 00:43:12,933
that the maritime construction world has to offer.
768
00:43:14,330 --> 00:43:15,940
If it does work to save Venice
769
00:43:15,940 --> 00:43:18,740
from more frequent devastating floods,
770
00:43:18,740 --> 00:43:20,550
visitors from all over the world
771
00:43:20,550 --> 00:43:22,090
will still have the opportunity
772
00:43:22,090 --> 00:43:26,678
to admire this wondrous city of water for decades to come.
773
00:43:26,678 --> 00:43:30,011
(soft orchestral music)
62422
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