Original subtitles

♪ ♪

NARRATOR: Rapa Nui.

Also known as Easter Island.

This tiny little island in the South Pacific is world—famous

For one thing.

The moai.

Moats are incredible.

The moai is the first part that people see.

NARRATOR: These enigmatic stone giants

Stand like sentinels all around the island.

But what was their purpose?

And why have so many fallen?

It is easy to imagine that this is the scene

of some catastrophe where things fell apart.

NARRATOR: For centuries,

Western researchers have studied the moai,

Trying to answer these questions,

and they've come up with their own theories.

But now, new research that looks beyond the moai

Is challenging those views.

TERRY HUNT: In all the evidence that we saw,

We were seeing signs of sustainability.

There was really no evidence of collapse.

NARRATOR: And Rapa Nui experts are reclaiming their heritage.

HETEREKI HUKE: For you, this can be an ancient, abandoned village.

For me, it's the place where my family used to live.

NARRATOR: Genetics is revealing surprising clues

about the origins of the island's earliest settlers.

ALEX IOANNIDIS: When we first saw this,

we thought maybe we did something wrong.

NARRATOR: From their incredible engineering

To their beautiful and unique writing...

HUKE: Some people say that they contain legends.

NARRATOR: ...the real story of Rapa Nui

is finally coming to light.

"Easter Island Origins."

Right now, on "NOVA."

♪ ♪

♪ ♪

NARRATOR: Most visitors come all the way to Easter Island

Because of these stone statues: the moai.

HUKE: Moats——

They are amazing and they're outstanding.

And they are unique.

♪ ♪

NARRATOR: Constructed between 1300 and some time after the 17005,

There are more than 1,000 of these giant carved figures

scattered across the landscape.

Cut from volcanic rock,

some are more than 30 feet high.

Overtime,

all of the moai have fallen down.

The 50 or so that are upright today

were put back up in recent decades.

With their backs to the sea,

They stare impassively into the island, arms held rigidly

By their sides.

Some stand on ceremonial platforms known as ahu.

Others are sunk into the earth.

But for the people who live on Rapa Nui,

Easter Island's true name, the moai are just the beginning.

HETEREKI HUKE: Moats are incredible.

But Rapa Nui is so much more than that.

And its archaeology is so much richer than just moats.

The moai is the first part that people see,

but behind the moats there is a big history.

(translated): Everywhere you walk,

you can find the remains of the past.

And that's why for us everything is always important,

not just the moai.

(translated): Our connection with each of

The archaeological sites has a direct connection with family.

It's not a legend, it's not a myth,

it's not a made—up story

or something discovered by archaeologists.

It is something that belongs to us.

♪ ♪

NARRATOR: One archaeologist who believes the story of Rapa Nui

Encompasses more than just the moai

is Sonia Haoa Cardinali.

Born on Rapa Nui 70 years ago,

She has dedicated her entire life to the history

and anthropology of the island.

SONIA HAOA CARDINALI: I feel sorry

when they just talking about the moai.

70 percent of the island is surveyed,

more than 25,000 archaeological site.

So that's means not only the sites,

It's mean also how people live,

what's they do, the family, and everything.

NARRATOR: Sonia wants to understand more about the moai,

But she and other Rapanui islanders

see them as only part of the puzzle.

There are bigger questions to ask.

Who are the ancestors of the Rapanui people?

Where did they come from?

And how did they survive and thrive in this remote

And hostile land?

♪ ♪

(birds chirping)

The island of Rapa Nui stands alone.

♪ ♪

The easternmost inhabited rock of the Polynesian island chains,

it lies approximately 2,000 miles

from the Tuamotu Archipelago of French Polynesia in the west,

And Chile in the east,

4,500 miles from Hawaii.

Only 14 miles long by seven miles wide,

Today most of the roughly 8,000 inhabitants live beneath

an extinct volcano on the western corner of the island.

♪ ♪

First encountered by the Dutch in 1722,

It was claimed by the Spanish nearly 50 years later;

then annexed by Chile in 1888.

But when the original Rapanui people first came to this land,

and where from, remains hotly debated.

The general consensus is that the first people to settle here

Were sailors from other Polynesian islands,

Migrating east sometime around 1200 CE.

We are Polynesians.

Our life was the canoe, and our territory was the ocean.

Polynesians, we were populating

and colonizing islands across the Pacific.

♪ ♪

NARRATOR: That belief forms the heart of Rapanui identity,

cherished by Elders like Carlos Edmunds.

(translated): In ancient legends it is said

that in the month of October,

The Rapanui went out to sail

their boats to new lands.

(translated): I am not surprised by anything,

We're great sailors and that is

How we arrived to the island.

NARRATOR: It is the bedrock of Rapanui oral tradition.

HUKE: There's knowledge in the old people, in the oral history.

Behind every legend, there's knowledge there.

NARRATOR: Legends handed down from generation to generation

tell how and why their ancestors came to this land.

They are retold even today by Rapanui performers

Dedicated to keeping the old traditions alive.

(man speaking Rapanui)

STORYTELLER (translated): Haumaka went into a spirit dream

looking for a new land for the king,

till he found the navel of the world.

(speaking Rapanui)

(translated): He tells the dream to the king, who summons seven scouts

and sends them in the direction of the dream.

To find and explore the island.

(man speaking Rapanui)

(translated): Hotu Matu'a and his wife follow in a ship called Haua lki Nui.

(speaking Rapanui)

(translated): The scouts call down to him saying, "Turn back!

"Turn back! This is a bad land.

The weather changes all the time and our crops cannot grow here."

Hotu Matu'a replies,

"We came from a bad land

"where the ocean kills the people with great waves.

Let's make this a good land for our people."

(speaking Rapanui)

That is the base of all our history.

Fortunately today,

science and scientists are helping us

to show how oral tradition was the first,

the most, and the real history.

NARRATOR: That oral tradition reflects a deep and fundamental truth.

For settlers migrating from the warm, tropical islands

of Western Polynesia,

this windswept lump of inactive volcanoes

In the southeastern Pacific was a "bad land"

Where their crops could not grow.

Rapa Nui is a subtropical island.

So there's a big difference in climate

To the tropical islands, for example,

of French Polynesia.

The problem was that some of those tropical species

just didn't grow and didn't take.

NARRATOR: Because it's colder here, the first settlers of Rapa Nui,

Traveling from the Polynesian tropics,

would have struggled to grow any plants they'd brought with them.

♪ ♪

One man who is fascinated by how those settlers survived

on this "bad land" is HETEREKI HUKE.

You know what, there's not that much material...

NARRATOR: An architect by trade, Hete started an office

in 2014 to record Rapa Nui's heritage

through the archaeological record.

At that moment, there were not many

Young researchers in Rapa Nui.

They're releasing the... (indistinct chatter)

NARRATOR: So Hete turned to Terry Hunt

and Carl Lipo from the U.S.A.

HUKE: We have been collaborating

With Carl and Terry for a long time,

and we have done so many things together.

They were a great support

during these fieldworks.

And that was amazing, because with Carl and Terry

We could map the rocks and at the same time,

We could have the legend behind them.

And that, that is just beautiful.

NARRATOR: One of the sites they studied was Ahu Tepeu,

Which lies on the northwestern coast of the island

and was a typical ancient Rapanui settlement.

Central to its layout is the ahu,

A raised stone platform.

At Ahu Tepeu, there are five of these.

HUKE: Some of them with moats, and some others without.

NARRATOR: Fanning out from the ahu are the houses, chicken coops

And walled gardens known as manavai.

And behind the houses lie the fields that fed the community.

HUKE: For you, this this can be an ancient, abandoned village.

For me, it's the place where my family used to live,

and they still are here.

This place is quite alive for us.

So the approach of a Rapanui researcher,

or any Pacific researcher,

would be dramatically different from a Western researcher.

NARRATOR: Rapanui and Western researchers agree

That the ancient settlers were Polynesian-—

but where did those Pacific Islanders come from?

Some previous research suggested that they came

from the islands of East Asia.

But in 1947,

a Norwegian explorer named Thor Heyerdahl

launched an expedition called Kon—Tiki,

Intended to prove a drastically different view

Of where the Polynesians originated.

(man speaking French)

(translated): Thor Heyerdahl proposed the idea

that the Polynesians actually

Originated in South America.

To demonstrate this, he managed to build a boat,

or raft, made of balsa,

a South American wood.

He made the crossing on this raft in a few weeks,

landing on the Tuamotu Archipelago,

which is now in French Polynesia.

NARRATOR: His theory on South American origins

Flew in the face of known linguistic evidence.

So Heyerdahl followed this up with a series

Of archaeological expeditions to Rapa Nui.

But despite years of investigating the island,

he could never prove a definite link to South America.

One Rapa Nui archaeologist who worked with him

Was Sonia Haoa Cardinali.

CARDINALI: I worked with Thor Heyerdahl

for almost ten years

and for me it's an honor to work with him.

No matter how we think about his theory,

never forget that he's the one of the person

put Rapa Nui in the map.

NARRATOR I In Heyerdahl's day,

experimental archaeology seemed the only way

to explore possible links

between Polynesia and South America.

But today we can use DNA—— which is a powerful tool

for tracing human ancestry.

So did the original settlers of Rapa Nui

have links with South America?

One geneticist who set out to answer that question

was Andrés Moreno Estrada.

ANDRES MORENO ESTRADA: Genetics can be a powerful tool

to answer this big question about whether

the Rapanui people made contact or not

with Native Americans in pre—history,

which has been a debate that has been on for decades.

NARRATOR: Andres put together an international team,

including researchers from Hawaii and Rapa Nui,

to study the DNA of the people of Polynesia.

And they reached out to the community

to gain the support of Rapa Nui's elders.

ESTRADA: Community engagement is really

the essence of all these approaches.

When you study human genetic diversity,

it's all about humans, really.

It's a voluntary participation, so it's really key

to talk with the community beforehand.

And as we carry out the research as well,

keep them informed about the results of the study.

NARRATOR: Collaborating with Andrés

is genetic data analyst Alex IOANNIDIS.

IOANNIDIS: What I really love about genetics is it's essentially

About participation with the people

whose story you're telling.

It's their sample that's telling the story.

NARRATOR: Stories like Bianca's—— the daughter of a Chilean father——

who moved back from mainland Chile

and wanted to know if what her mother had told her was true.

(translated): When I arrived here on the island,

everyone told me I was Chilean.

I was a mongrel.

So that's why I did the study,

because my mother taught us our genealogy.

CARLOS EDMUNDS: (speaking Rapanui)

(translated): I am happy that

Andrés came to do this work

About the blood of the Rapanui,

where we descend from,

so that the Rapanui know

Where their current ancestors are from.

TUKI (translated): Andres suggested we do the study to know

If we really have ancestry from Polynesia.

PONT IKA (translated): It's absolutely important,

Since our ancestors know

they are Polynesian,

but if there is a study that confirms it,

it's even more important.

♪ ♪

NARRATOR: An individual's DNA is contained within

23 pairs of chromosomes, known as a genome.

IOANNIDIS: And that's your genetic fingerprint.

NARRATOR: When they began their research, Andres and his colleagues

were expecting the Rapanui fingerprint

to contain markers showing

Mostly Polynesian, Spanish, and Chilean ancestry,

since these were the main colonists of the island

in the last 250 years.

To extract the DNA,

they take swabs from their volunteers in the field,

then take it back to the lab

in cold storage, for analysis.

MORENO—ESTRADA: DNA samples are loaded into a sequencer so that we can get

the pieces of DNA that make up

the whole genome of that individual.

NARRATOR: This allows the researchers

To identify specific chains of DNA

that can be attributed to certain groups.

Red denotes Spanish ancestry;

Blue, Polynesian; green, Chilean...

and yellow, other European.

MORENO—ESTRADA: The process is very rewarding

Because participants are very interested in knowing about

their own genetic origins.

And when they see they actually they have

retained a lot of the Polynesian roots

In their DNA, it's something that helps them

to basically value and identify their own lineages.

NARRATOR: Most of the results

helped confirm the islanders' beliefs

about their Polynesian origins

mixed with more recent colonists.

ALVARO ATON: I just found out the results.

I'm so mixed; my mom is from Chile

And from England, and Scotland.

And my father is an islander,

but he's also mixed with French and other people.

So it's very interesting to know where you come from.

(speaking Spanish)

(translated): I'm very, very, very happy.

Because this is my mother's story,

And this study from Andrés proved it scientifically.

But my mother already said it a long, long, long time ago,

since I was born.

NARRATOR: They did, however, find some pieces of DNA

That they didn't expect.

IOANNIDIS: When we first saw this,

we were really surprised, and so we thought

maybe we did something wrong.

MORENO—ESTRADA: We thought, "Well, let's double check this."

NARRATOR: These pieces of DNA seemed to have their origins

In South America.

But when they tried to pinpoint the source, they got a surprise.

They were quite different from the more modern

Chilean ancestry found in some volunteers.

We compared it to a panel of indigenous groups

from across the entire Pacific coast of South America

and the closest match was the Zenú group.

♪ ♪

NARRATOR: The Zenú are a Native American people

Who occupied the coast of Colombia,

long before Chile annexed Rapa Nui in 1888.

How could their genetic markers wind up

In the DNA of modern Polynesians?

And how many generations back did they go?

Because each parent only hands down

half of its DNA to the next,

Alex was able to figure out when that piece

of pre—Colombian DNA had been incorporated

Into Polynesian chromosomes,

by measuring its length.

IOANNIDIS: We can actually look

at the length of those individual pieces

and figure out how many generations ago

This combination of Native Americans

And Polynesians took place.

NARRATOR: The date they came up with was much earlier than they expected.

IOANNIDIS: We saw very small pieces indicating

that this ancestry from the coast of Colombia

entered Rapa Nui a long time ago,

Actually in a period around what we would call

the European Middle Ages, around 1200 AD.

NARRATOR: What's more, the same identical DNA segments

Were often seen in volunteers from different islands.

IOANNIDIS: Which means that these segments came from the same ancestors.

And since they came from the same ancestors,

we think that this means there was a single contact event

Between indigenous Americans from the coast of Colombia

and Polynesians.

MORENO—ESTRADA: This means that a group of Polynesians met, somewhere,

With Native Americans, had descendants,

and more likely, this never happened again.

NARRATOR: By looking at the DNA of people on other Polynesian islands,

the team traced the tell—tale genetic markers

Back to the Marquesas and Tuamotu Isles.

And were also able to plot a timeline of migration

across Eastern Polynesia to Rapa Nui from around 1100.

IOANNIDIS: Polynesian migrations spread east

into Tuamotu Archipelago up to the Marquesas

and all the way down to Mangareva,

and from there all the way out to Rapa Nui around 1200.

the team traced the tell—tale genetic markers

there's something else they all have in common——

Something much bigger than DNA.

NARRATOR: Looking closely at these particular islands,

Rapa Nui, and Raivavae,

have these very large stone statues on them.

Where the idea of creating large stone statues comes from,

IOANNIDIS: Most of these islands—— the Marquesas,

and we can't say for sure

if these islands developed the idea independently,

but the fact that they're all existing together

in the same genetic cluster suggested to us

that this culture was developed once

and spread to all these islands.

NARRATOR: Sonia believes that even if this culture

developed within the Polynesian islands,

there was also some influence from South America.

And behind the spectacular Ahu of Tongariki,

she believes she has the evidence to back up her hunch.

We see there very good evidence

of influence of South America.

NARRATOR: This single broken moai

has its hands across its body in a style that can be found

in ancient Colombia.

♪ ♪

CARDINALI: If you compare with the South America,

it's the same.

The hands and the description of the arms, the body.

It's completely the same.

There is no doubt the influence of South America.

In here, we have the structural evidence.

I cannot lie you, that is, that is look like a moai normal.

No. (chuckles)

No, maybe if I am blind, yes.

But, it's there.

NARRATOR: But this is the only moai on the island

with arms across its body.

All others have their arms by their sides.

So it cannot prove that the template

for carving statues

in stone came from ancient Colombia,

though the DNA suggests some ancient, albeit isolated, link.

What is provable is where the moai were created.

Almost all of the statues scattered around the island

were carved from the volcanic rock of Reno Raraku.

And on the slopes of its massive crater,

about 400 statues can still be found

in various states of completion.

High up on these slopes,

Carl and Terry can see evidence of the skill

and ingenuity of the Rapanui stonemasons.

TERRY HUNT: It's amazing being up this high in the quarry

and all the work and quarrying

out of the bedrock and statues this big

that way up here had to be taken down the slope.

You can see several moai being carved.

The large moai here,

and there you can see the beginnings of moai

up on the side as well, high up here in the quarry.

CARL LIPO: Yeah, What we're seeing is the aggregate of events

that occurred... HUNT: Yeah.

LIPO: ...over 500 years of activity

here at the quarry, not a final product.

This is all the things that happened here.

It's interesting because the quarry,

it's kind of a common area that's shared.

And so there's an understanding

that everyone on the island, every community on the island

has access to the resource here.

NARRATOR: But rock isn't just confined to the quarry.

All over Rapa Nui, rock is spread across the land.

To Western explorers like Captain James Cook,

who visited the island in 1774,

this looked like a wilderness.

JAMES COOK (re—enactment): "The ground had but a barren appearance,

being a dry hard clay, and everywhere covered with stones."

HUNT: The early European visitors saw

crops being grown in stones,

and they thought this was

somehow pathetic because

they're expecting to see

ploughed fields

and the agriculture of Europe.

NARRATOR: How could the Rapanui survive

on what appeared to be such a barren wilderness?

But this wasn't what it seemed.

HUNT: The soils on Rapa Nui are nutrient poor.

There is an ingenious solution to that,

and it's using rock mulch.

NARRATOR: Volcanic rock is packed full of nutrients

that bring new life into the world.

Somehow the ancient Rapanui had learned

how to make the best of this austere landscape

by fertilizing their fields with stones.

HUNT: And using rocks in cultivation

will release nutrients into the soil

and make them available to the plants.

NARRATOR: Sonia also sees lots of evidence that the rock—strewn wilderness

described by Captain Cook was actually fertile fields.

Here you see a very nice complex.

And that's mean you have everything here.

In the center part,

you can see they take all the rocks,

and what you see in, in the landscape around here,

it's like a garden, yeah?

♪ ♪

NARRATOR: This was not the first or last time

that Western misconceptions would color

the history of Rapa Nui.

Right from their very first encounter on April 5, 1722,

the world—view of its European visitors

would have a profound effect on the island.

The name Easter Island comes from the first Europeans

arriving here on Easter Sunday.

The modern traditional name is Rapa Nui,

and the older traditional name is Te Fire 0 Te Henua,

which really means "the navel of the world,"

which probably reflects the island's isolation

and—or its centrality as the whole world.

♪ ♪

NARRATOR: The first encounter between the Dutch explorers

and the local residents

was marked by curiosity

and a tragic misunderstanding.

KÜHLEM: There was a lot of interest in, in the landing party.

There was a lot of interest in the construction of the ships.

People swam out to the ships.

They went aboard.

They measured every aspect of the ships.

And the landing party was quite substantial.

(man shouting)

NARRATOR: The Dutch landing party found themselves confronted

by a vibrantly painted man.

HUNT: He performs what they perceive

as a very strange dance.

And this strange dance was probably

really an important ritual

that the Rapanui would have perceived as proper

in these people coming ashore to their land.

He saw the possessions that the Dutch had——

the clothes, the hats, and the guns.

And he reached for the gun...

(man speaking Rapanui)

KÜHLEM: And several crewmen opened fire.

(gunshots firing)

So the very first encounter

on the shores of Rapa Nui

was overshadowed by 12 islanders dead and many more injured.

CAUWE: (speaking French)

(translated): This story is a case

of misunderstanding, a clash of cultures.

The islander is curious and wants to know

what the soldier has in his hands.

He wants to hold it, feel it.

Meanwhile, the soldier is afraid

he is trying to steal the gun

and puts up a fight.

This is a clash of two completely different worlds.

NARRATOR: The clash of cultures that led to this massacre

would profoundly affect the way that Rapa Nui was perceived

by Western researchers in the centuries to come.

HUNT: Western preconceptions have colored the view

of Rapa Nui in many ways.

Seeing the moai, seeing the monuments here,

they can't imagine how, uh, people would move them,

with no wooden carts or wheels.

And because they don't understand

how it could have been done,

it leads to notions of the mystery of Easter Island.

And the mystery is really just what visitors didn't understand.

♪ ♪

NARRATOR: Just as with Captain Cook,

Western visitors saw a barren land,

covered in rocks, and devoid of the trees

needed to make wooden sleds or wheels.

But it wasn't always like this.

Researchers found pollen evidence

in the fossil record,

suggesting that 1,000 years ago,

much of this land was covered in dense forest.

(translated): One millennium later, the forests have vanished.

So, we have to ask the question: what happened?

(bird chirping)

♪ ♪

NARRATOR: For many Western researchers,

the answer lay strewn across the island

at sites like Ahu Tepeu.

LIPO: These are pieces of moai,

the large statues that once stood on top of the ah...

I don't know how many statues there were here,

maybe four or five.

And it's easy to look at these landscapes——

when you see the ahu,

when they're broken down,

and statues that are fallen and broken

like this one here, which has no head and just the body,

the head that's over here——

to imagine that this is the scene

of some catastrophe where things fell apart.

NARRATOR: To Western eyes,

this was evidence of a collapse of society.

So successive generations of Western scholars constructed

a narrative.

It explained the barren, rock—strewn land,

the collapse of the moai,

and the disappearance of the trees.

LIPO: The collapse story basically goes

that people got to an island that was filled with trees,

palm trees, other kinds of trees as well.

Sort of an earthly paradise

filled with food and opportunities for,

for the people that were here.

The moai building has often been portrayed

as some kind of frenzy, as some kind of competition

between different clan groups,

where lots of trees were cut down

in order to construct and to transport the moai.

NARRATOR: Archaeologists had long investigated

stone monument building

in places like ancient Egypt.

Westerners thought the moai

were probably moved on wooden sleds or rollers

pulled by hundreds of men,

which required people and trees——

lots of people and trees.

And these Westerners assumed that moai building

had spiraled out of control.

People here kind of got into a moai mania

that they started to make bigger and bigger statues.

And at some point, that overexuberance of

statue construction ultimately

depleted the island of the resources needed

to make up ahu in the first place.

NARRATOR: According to this view,

moai building deforested the island.

The soil was starved of nutrients,

leaving a barren, rock—strewn land.

Then, this theory goes,

things got worse.

KÜHLEM: The scarcity of resources

resulted in a societal collapse.

The island erupted into inter—tribal warfare

and led to a very impoverished population

living on a barren island.

(translated): And the best evidence to prove this

was that all the statues had been thrown to the ground.

80 something violent must have happened.

And the one visible proof we have today

is all the statues that were toppled during these "wars."

♪ ♪

NARRATOR: This so—called collapse theory posited

that the island once had more than 10,000 inhabitants,

whose own folly triggered a collapse

of the forest ecosystem and reduced them

to a mere 3,000, living on the scraps.

For many Western scholars, it was a compelling narrative,

a morality tale for our times.

But for some researchers, this idea had one big problem.

LIPO: When we looked at the evidence on the ground,

we simply didn't see evidence of warfare.

It looks like this one is being dismantled,

because we find some of these construction elements

in the other features over there.

NARRATOR: For Hete, what were once considered ruins at Ahu Tepeu

turn out to be evidence of continuous use.

HUKE: This is the head of a moai

that was part of the second ahu

in this ceremonial complex.

In the second ahu, all of the moats

lay down in the back of the platform.

And that is because that second ahu

was being dismantled to enlarge the first one.

NARRATOR: Pieces of earlier moai were being reused

to create an even more spectacular ahu.

HUKE: From this particular ahu,

we couldn't say that there's evidence of collapse.

There's evidence of transformation

and human societies changing.

And that's beautiful.

Destruction is recycling and creation.

It's part of a larger process.

And in a certain way, this moai reflects that.

♪ ♪

NARRATOR: Across the island, what some Western researchers had seen

as evidence of collapse didn't stand up to scrutiny.

Even the island's caves,

long seen as refuges against an enemy tribe,

appear to be something very different.

LIPO: This is a great example of a cave that has that construction

where they've taken a cave and added these features to it.

HUNT: Yeah. It's not a, it's not a refuge cave.

It's not a hiding place.

It's a habitation.

So they made this nice entrance

with paving stones and everything.

LIPO: They've used lots of different materials

like this paenga stone.

NARRATOR: Paenga are a kind of foundation stone found in elite houses.

The holes bored into them acted as bases for the wooden struts.

The use of these paenga in cave walls was argued

to be evidence of some last—ditch defense

against attack.

HUNT: Some people think that this is evidence

of tearing down, uh, elaborate or elite houses,

and, and reusing the stone out of desperation.

But these stones are reused everywhere.

LIPO: We see the reuse of these paenga stones

not only in things like ahu,

but also in the chicken houses, the hare moa,

as well as earth ovens.

So they're really used in all kinds of contexts.

People use the stone that was available to them,

and some of that stone were paenga.

Reusing and recycling stone materials here

is really the norm.

NARRATOR: At another set of caves nearby,

Hete, Carl, and Terry find yet more evidence

of a thriving community.

Here, the Rapanui even used the collapsed lava tubes

as hothouses...

...fed by something rare

on an island of permeable volcanic rock:

an abundant supply of water

in caverns deep within the caves.

HUKE: In those caves, we can find fresh water.

It was one of the largest water reservoirs.

So, it's a very rich part of the island.

NARRATOR: So Rapa Nui's caves weren't just simple refuges.

They were complex, sun—dappled ecosystems

that had been used for centuries,

long before the collapse that was supposed to have driven

people into them.

HUKE: Nothing here in Te Pahu

or in the area that we worked

shows that people were struggling.

On the contrary, they were thriving.

We were seeing signs of sustainability.

There was really no evidence of collapse.

♪ ♪

NARRATOR: Even though Carl and Terry found no direct evidence for collapse,

they would not dismiss the idea without more research.

Especially when it came to the population of the island

over time.

They started by mapping all the moai

on one side of the island.

Then moved onto the settlement and resource sites.

LIPO: Our goal is really to sort of characterize

the settlement systems

and how people are distributed across the landscape

and use resources there.

We've got a good sample of the communities,

but we're continuing to do that as an ongoing basis.

NARRATOR: They matched these with carbon dates from the sites

to build up a pattern showing when each settlement was in use.

Then they ran them through a computer model,

which converted the carbon data into population numbers,

by calculating the highs and lows

of human activity on the island.

The results confirmed their hunch.

It showed the population rise

from a small number of first settlers,

continuing to grow steadily,

with no Sign of collapse at any point.

HUNT: The population could fluctuate slightly,

but its average maximum is probably around 3,000.

Probably what Europeans encountered

when they first arrived on the island.

NARRATOR: A maximum population of 3,000

was much smaller than the numbers cited

in the Western collapse story.

HUNT: The collapse theory proposed

all kinds of numbers: 7,000,

10,000, 15,000, even up to 30,000

population forth is small island.

NARRATOR: But Carl, Terry, and their colleagues

found no evidence that there were ever

that many people living on Rapa Nui.

LIPO: The lack of huge populations being on the island

sort of takes the wind out of the collapse theory.

Because, in fact, there's nothing from which to collapse.

There isn't a large population.

NARRATOR: But if you don't have tens of thousands

of people living on the island,

how could the Rapanui build and transport the moai?

For some Western researchers,

Rapanui oral history suggested an answer.

(man speaking Rapanui)

STORYTELLER (translated): There are many stories about Tu'u ko Iho.

Some people say he was in charge of the second boat

that brought people here.

Others believe that he was the great king

who founded the island.

But all agree that it was he

who made the moai kavakava walk.

(man speaking Rapanui)

NARRATOR: This actually referred to small wooden statues.

But some Westerners thought it also described the stone moai.

Thor Heyerdahl and his colleagues

attempted to move the statues upright,

to effectively make them walk.

But the experiment hadn't worked,

so most experts still believed

that they were dragged on their backs.

But when Carl and Terry analyzed the moai

lying by the roads that led from the quarry,

they noticed something significant.

These are impressive things, aren't they?

HUNT: We're looking right here

at the reason why they were not transported

on logs on their backs. That's true.

How would they be in this position,

face down and the neck broken?

Yeah. It makes no sense.

That just simply doesn't happen

if they're on their backs on rollers.

NARRATOR: They also noticed a structural difference

between moai lying on the road and those standing on the ahu.

A moai on the ahu has a flat base,

so the statue stands straight up.

But most of the moai lying on the road

have angled bases.

And Carl and Terry believe that angle

had a very specific purpose.

LIPO: Road moai has to be shaped in a way that can be transported.

They did it by shaping their base so they leaned forward.

It enabled them to walk.

HUNT: This is a great example of, of

the forward lean of these transport moai.

LIPO: So if you took the statue, and we could put it back up,

it would be leaning really far forward.

It means that as you rock it side to side,

it falls forward across that front edge... Yeah.

...and takes a step. Yeah.

Without that, it would just rock back and forth

and not really go anywhere.

And walking really describes what these moai did.

NARRATOR: To test their theory,

in 2012 Carl and Terry built a model of a moai out of concrete,

carefully mixed to match the fragile density

of the ancient statues' volcanic rock

and made it walk.

(crowd chanting "heave ho")

LIPO: In our experiments, we found it took remarkably few people

to move the statue.

And we were terrible at it, you know?

We were the least expert of any people

who've ever moved a moai in the world.

Uh, but we were able to do a five—ton statue with 18 people.

NARRATOR: Not all are convinced that the moai walked.

♪ ♪

But if they did,

trees were not needed to move the moai.

And the Rapanui continued to erect moai

long after the trees had died out.

So why did the Rapanui go to such lengths to build them

in the first place?

What were the moai for?

(birds chirping)

One tradition that might one day tell us the answer

is being lovingly preserved by Luis Huki,

a park ranger on Rapa Nui.

LUIS HUKI HINOJOSA: (speaking Spanish)

(translated): My name is Luis of the Huki clan.

At the moment, I'm carving rongorongo,

which is the tradition of

our forefathers, of my father.

And right now,

I'm following their tradition.

I've been making rongorongo tablets for 25 years.

I like it because it's a tradition

that at a certain time,

the translation was lost,

and now we must conserve it and continue to make the rongorongo.

NARRATOR: Rongorongo is the traditional writing system of the Rapanui.

It is inscribed onto wooden tablets.

HINOJOSA: (speaking Spanish)

(translated): The process starts with preparing the wood

and sanding it.

Once it's sanded,

the wood is traced so you can start to draw on it.

And then, after that, you carve the rongorongo.

NARRATOR: Luis is one of just a handful of people still carving rongorongo.

He's doing this to help preserve his culture.

(translated): It's unique, and if we lose it,

we lose part of the history of Rapa Nui.

NARRATOR: No one knows how old rongorongo is, or what it actually says.

But in a secluded monastery in Rome,

Silvia Ferrara is studying a remarkable wooden artifact

which might help answer those questions.

This is the Échancrée tablet.

It's made of wood, and it's one of the 27 tablets

written in this script, which is still undeciphered.

NARRATOR: The Échancrée tablet was gifted to the Bishop of Tahiti

in 1869 by Catholic converts from Rapa Nui.

It is one of only 27 scattered across museums around the world.

And the way its figures are orientated

suggests a very unusual reading method.

What you need to do is turn the tablet

from one line to the next

in order to read it.

And this is a unique feature

of this writing system.

No other script works in the same way

all over the world.

So it's really quite special.

NARRATOR: Despite this unique system,

it has been said that rongorongo

was inspired by European writing.

That's kind of a degrading view of Rapanui ingenuity.

It's not only simplistic, but it's patronizing.

It's one of the most unique and beautiful

forms of knowledge of art in the world.

Nevertheless, we have to face critics,

or thoughts that we were copying.

HUNT: The glyphs in rongorongo are clearly connected

to the art on the island.

You see the glyph forms in petroglyphs,

They don't imitate European writing in any sense.

NARRATOR: To put the debate to bed once and for all,

Silvia gained permission to radiocarbon date this tablet.

FERRARA: The radiocarbon date

points in the direction of a 15th-century date,

which antecedes the arrival

of the Europeans by more than 200 years.

NARRATOR: Silvia believes this might make rongorongo

one of the few instances

of independently invented writing in the world.

But what was rongorongo for?

Many believe that it contains the secrets of Rapanui culture.

HUKE: Some people say that they contain legends or rhythms

or encrypted instructions of how to move moai,

or develop some technologies.

There are many, many different theories about it.

But what we do know is that they contain knowledge.

♪ ♪

NARRATOR: Until rongorongo surrenders its secrets,

researchers are using tried and tested scientific methods

to understand why the moai and the ahu platforms

are located where they are.

HUNT: When we, we look at the question of

where ahu are located,

why are they located there?

Why are some of them very large and some of them smaller?

Why are there some ahu in the interior,

while most of them are on the shoreline?

LIPO: It's easy to describe it as being religious.

Certainly, that's part of the story.

But the question is why would you invest

so much energy in doing these over and over again?

NARRATOR: They started with a map.

They marked out the locations

of all the ahu on the east side of the island.

Then they began to compare them

with the locations of vital resources.

They chose three as the key sources

of sustenance: rock mulch, seafood, and fresh water.

But when they tried to map the ahu over the rock mulches,

a simple mismatch became glaringly obvious.

LIPO: There's rock mulch everywhere across the island,

but we don't see ahu and moai everywhere.

What we find is, in fact, that ahu and moai

are in particular locations,

independent of the, of the mulch itself.

NARRATOR: Next, they looked at resources from the sea.

LIPO: When you drive around the island,

you see one after the other, an ahu with moai,

all the way along the coast.

And, of course,

the coast has a lot of resources.

Fish, shellfish, other kinds of things

that would support populations.

NARRATOR: But while the ahu on the coast

match sea resources very well,

this cannot explain the ahu

erected in the interior of the island.

That left one final resource:

fresh water.

Most of the moai are along the coastline,

with their backs to the sea.

At first glance, that doesn't seem like a good place

to find fresh water.

But look a little closer.

The water's fresh.

You think this water's salty, that it's seawater, but in fact,

this is a freshwater seep, a source of water

that comes from the interior of the island,

moves to the underground, and then comes out at the coast.

It's a place where Rapanui people

access water for their daily lives.

HUNT: On a young volcanic island like Rapa Nui,

the rocks are very porous.

The rainwater will enter the island and flow through

the porous island and into lava tubes, etc,

and will come down to the level

and float on top of saltwater

and then enter the ocean at low tide.

LIPO: When Captain Cook arrived on the island,

what he saw was people

drinking straight from the ocean.

And he thought, "This is crazy, why would people do that?"

What he was actually seeing is people

drinking water that comes from these freshwater seeps

that emerge right at the coast of the island.

NARRATOR: And when Carl and Terry compared their map of ahu moai

with a map of freshwater sources,

they got a roughly 90 percent match.

HUNT: In fact, the locations of freshwater

are the best predictor of the locations of ahu

throughout the island.

NARRATOR: For many, this near—perfect match is not surprising,

because ahu are usually linked with settlements.

KÜHLEM: Those hamlets or villages

are located, in many cases, close to water sources,

which makes perfect sense that the essentials for survival,

like your crops and your drinking water,

is close to where the people actually settle.

NARRATOR: Yet for Carl and Terry, it's the precise location

of the moai that is the key to this theory.

LIPO: One of the interesting aspects about Rapanui people

is that they lived in a dispersed settlement pattern

in which people used the landscape around the ahu

in sort of a wide area.

But they're brought together at the ahu and the moai.

NARRATOR: Again and again, the ahu—— not the settlements—-

are closest to the water.

LIPO: So we find, in fact, the ahu and the moai

right next to the critical resource because, in fact,

that is the heart of the community.

♪ ♪

NARRATOR: It seems the moai acted as a statement,

erected close to a community's most vital resource.

But Rapanui tradition would see this differently.

HUKE: They represent the soul of a dead king.

So moats, their location and eventual collapse,

is also related with an evolution

of our political and social structure.

The statement is "We're honoring our ancestors."

And they might even say to us, if we could time travel,

"Don't you honor your ancestors in this way?"

♪ ♪

NARRATOR: Looking at all the archaeological evidence,

it seems more likely that,

rather than a self—inflicted ecocide,

the true collapse of Rapa Nui society

was caused by outside influences.

HUNT: As time went on, and the evidence accumulated,

we realized that a lot of what people thought

was collapse was something that actually happened

after Europeans arrived.

And it had an entirely different cause,

and that was the introduction of Old World disease.

HUKE: There was the smallpox,

there was the Spanish Flu,

leprosy, slave trading.

It was difficult to live here,

and it was more difficult to keep the social structures

and the life as the way that we knew it.

LIPO: Over time, we see people sort of abandoning ahu and moai.

It's a loss of population.

There's just fewer people

because of the effects of diseases.

So people are not attending to the ahu

and rebuilding them in the way that they did in the past.

NARRATOR: Things got even worse in the 18605.

KÜHLEM: Peruvian slave traders captured about a third

of the population on the island

and forced them onto their ships to work in Peru.

(translated): There were protests.

Even the Vatican got involved.

And consequently, the companies were forced

to return the inhabitants to the islands.

However, these people had contracted smallpox

on the American continent.

Only 15 people made it home,

and this was enough for an epidemic of smallpox

to break out there.

(speaking French)

NARRATOR: By the time it was over,

there were less than 200 Rapanui left alive.

♪ ♪

The true story of Rapa Nui

is one of survival against the odds

by an ingenious and resilient people

who came to a "bad land" and made it good.

But that story has been overshadowed

by a Western fascination with the moai.

And for Sonia and Hete, that is the true tragedy

and triumph of Rapa Nui.

CARDINALI: If we look only the moai,

we are not making this place bigger.

We're making it small.

This mean you don't believe in my capacity as a human being.

HUKE: If there's one thing

that I would like people to take from Rapa Nui,

it's that the history has been narrated

by a very selected group of people.

There are different realities.

The world is full of beautiful, amazing stories

that deserve to be told,

and people deserve to hear.

Our history is not unique.

We share with many islands,

and we share a beautiful past,

a complex present,

and many, many tragedies in the midway.

♪ ♪