All language subtitles for The UnXplained s06e02 Land of the Lost.eng

Secret military programs,

warping space and time.

A mysterious device,
with the power

to peer into history.

And places on our planet
where the past,

present and future exist
all at once.

For thousands of years,
humanity has been captivated

by the idea that man might
one day travel through time.

Some of the world's greatest
scientists firmly believe

that this extraordinary feat
is theoretically possible.

But what if time travel
is not just a theory

but has already happened?

Is it really too far-fetched
to think

that certain people
have managed to journey

through the fabric of time,
whether by design

or perhaps by accident?

Well, that is
what we'll try and find out.

Human beings experience
time moment by moment.

We spend our lives
following the steady,

one-way march of the clock

as we make our journey
from birth to death.

But what if it's possible

to take a different path
through time?

The great mystery of time
is that time and space

exist independently of us,

but we view it
in social and cultural terms.

For example,
we divide our day up

into work time and leisure time.

And we have
transportation systems

which have embedded timetables
and time zones in our head.

And so the notion of time travel
has always been popular

because the idea of
escaping time,

of being able
to step outside of time,

is hugely attractive.

The tantalizing
prospect of traveling through time

has long captured the
public's imagination,

making it a frequent subject in
pop culture and entertainment.

Our modern fascination
with time travel

can be traced back to the
work of author H.G. Wells,

and his groundbreaking
novel The Time Machine.

In 1895, the book
The Time Machine

by H.G. Wells was published.

And the impact that this
had on Victorian society

was incredibly deep,

because it gave
the scientific world

the idea that we could
indeed travel through time.

What makes H.G.
Wells' story, The Time Machine, unique

is that he had a
mechanism, a machine,

that you actually constructed,
it could control time.

That was different from
all of the other stories.

Ten years after the
publication of The Time Machine,

in 1905, physicist Albert
Einstein shocked the world,

when he published a
revolutionary theory,

which suggested that time
travel is scientifically possible.

What Einstein said is that
we all think of ourselves

as moving along a
straight line of time

from the past,
present to the future.

However, Einstein's
special theory

can allow this straight line
of time to become twisted

into a loop and
cause time to be bent.

And so that allows us with
the possibility of time travel.

Could the laws of
physics really allow us to travel

to any point in
the past or future?

And if so, is it possible
that a real-life time machine

may have already been invented?

At the height of World War II,

the Atlantic Ocean was
a dangerous battleground,

where German
submarines frequently

targeted American ships.

To help protect Allied vessels,

the United States
Navy reportedly initiated

a top secret program
that became known

as the Philadelphia Experiment.

The Philadelphia
Experiment is a series of

secret military projects

which took place in 1943

in a Philadelphia shipyard.

At that time, the Navy
was really interested

in camouflaging its ships.

The original idea
that the Navy had

was to actually make
the ship radar invisible.

The Philadelphia Experiment
involved a U.S. Navy destroyer

that underwent the most
strangest of experiments,

with the concept being

that if the ship were
surrounded by incredibly intense

electromagnetic fields,

could it distort our
vision of it enough

that it became invisible?

As the story
goes, on October 28, 1943,

government scientists
wrapped a fully crewed ship

named the USS Eldridge

in a cage of
electrified copper wire

and began the experiment.

But then, everything
went terribly wrong.

Supposedly,
after the switch was thrown...

all hell broke loose.

The ship was encased in fog.

Everyone
was running around the decks,

screaming in panic mode.

No one knew what was happening.

At that point, the USS
Eldridge vanished in green mist,

only to reappear in the
Norfolk, Virginia shipyard,

disappear again, then
about three hours later,

reappear in Philadelphia.

This was witnessed by a merchant
mariner called Carl M. Allen,

who claims that he saw
it vanish in a green mist

before returning
to the same spot.

And then, in Virginia, some
people witnessed the ship

appear there and
vanish there as well.

So, what is going on here?

Even more astonishing
than the ship's vanishing act

is that when it
returned to Philadelphia,

the crew appeared to have
sustained devastating injuries.

When the ship was boarded,

it was found that the sailors
were in horrible condition.

Many were dead

and others were found to be

embedded in the bulkhead
of the ship, still alive.

Some of the crew
seemed to be almost frozen in time

or stuck within
parts of the ship

and unable to actually get out,

which seems to suggest
the alleged teleportation,

involved with the
Philadelphia Experiment,

that it had actually
warped space-time itself.

According
to reports that surfaced

years after the
catastrophic experiment,

the USS Eldridge was
not only transported

across hundreds of miles

but it also seems to
have somehow traveled

decades into the future.

Allegedly, the ship
was actually catapulted

through time and space,

a completely unexpected result,

appearing at various locations,

like Chicago in 1969,

and Lake Mead in 1983,

only to disappear
and to continue

across the time
stream uncontrolled.

The Eldridge just randomly
skipped across time

achieving a rough
form of time travel.

Some of the accounts of
the Philadelphia Experiment

actually came from some
of the families of the sailors

who had volunteered to be
part of the initial experiments.

What had happened
was that afterwards

these sailors had been
declared dead... missing in action.

So it was a disaster
all the way around.

Did the U.S.
Navy conduct an experiment

that unexpectedly
resulted in time travel?

Some say the proof
lies in a number of letters

written by the key
eyewitness of the event,

merchant mariner, Carl M. Allen.

Carl Allen had
written a series of letters

to a author by the
name of Morris Jessup.

Allen wrote to
Jessup talking about

the Philadelphia Experiment,
and Jessup included

the series of letters in a book

called The Case for the UFO.

Afterwards, Jessup
was contacted by

the Navy, the Office
of Naval Research,

because somebody had sent
them a copy of Jessup's book.

And the Navy decided
to cover it up completely

and said that it was all a hoax,
that nothing had ever happened.

Jessup felt that this
was a confirmation,

that the Philadelphia Experiment
had actually happened.

Now, of
course, we certainly have

no absolute knowledge about
what the United States was up to

relating to time travel.

But the possibility should
not be seen as science fiction.

If the USS Eldridge

really did travel
through time in 1943,

then the U.S. military
clearly wants to keep it

a closely guarded secret.

And some claim that the
government further experimented

with time travel
during the 1960s,

as part of a top secret project

that sent people back in time.

27 million
people from around the globe

flock to the city
for the World's Fair.

The exposition showcases

a number of
remarkable innovations,

and the fairgrounds
are illuminated

with 100,000 light bulbs.

The sea of glowing lights
transforms night into day

and astonishes the public,
most of whom have never

witnessed anything
like it before.

This dazzling spectacle
was made possible

by a new form of electricity
called alternating current,

which was one of the
many important inventions

developed by famed
Serbian scientist, Nikola Tesla.

This period around the
end of the 19th century,

beginning of the 20th century,

was the zenith, really,
of Tesla's career.

He became famous.

Tesla was the man
who could see the future.

He was "Mr. Electricity."

Everything that Tesla
did was directed towards

this kind of overriding goal
of spectacular new inventions

for electrical transmission.

Nikola Tesla
is widely considered to be

a scientific genius who
changed the course of history.

But there are those who
believe that Tesla should

also be credited with an even
more extraordinary invention...

a time machine.

In 1943, Nikola Tesla died

and left all his notes at
the New Yorker Hotel.

When he died, the FBI
raided Tesla's rooms,

took the notes,

and in the notes
was a whole series of

speculative diagrams.

Allegedly, the United States had
access to time travel technology

from a number of papers

taken away from
Tesla's apartment,

which gave details
on how to create

a teleportation device,

and with teleportation you
could also have time travel.

Did the U.S.
government really seize plans

for a teleportation device
designed by Nikola Tesla?

And if so, is it possible
they used this information

to build a working time machine?

Young Andrew Basiago
is taken by his father

to visit a nearby
manufacturing plant.

Little does Andrew know
that this factory conceals

something truly extraordinary.

I was six years old
in winter of 1968,

when my father
took me to building 68

at Curtiss-Wright in
Wood-Ridge, New Jersey,

and there on the
floor of building 68

was a Tesla teleporter.

It was basically a large device.

It went all the way
up to the ceiling

and had two booms that were
roughly about eight feet high

and ten feet
across on the floor.

They looked essentially
like elephant tusks.

Between them was
a form of energy

that was sort of cascading
between the booms,

or armatures, of the device.

Jumping through that
radiant energy caused

a holographic
white tunnel of light

to open in time-space.

They were testing the
effect of Tesla teleportation.

After witnessing
the Tesla teleporter in action,

Andrew Basiago claims that
he was recruited by members of

a shadowy military
organization known as DARPA,

to participate in a secret
time travel program

called Project Pegasus.

Project Pegasus was a
classified defense-related

research and development
program of DARPA.

They were essentially
training and testing

American schoolchildren in
eight modalities of time travel.

There were 140 American
schoolchildren of my age

who were in the program.

We were also trainees
because we were expected

to become America's first
generation of chrononauts,

or time travelers.

According to Andrew Basiago,

the Tesla teleporter was used
to send chrononauts back in time

to observe, and even
influence, historical events.

A chrononaut essentially
was a time travel agent

in the sense that I
wasn't just involved

in testing and training.

I had missions
when I went there.

I was sent to Ford's
Theatre to see, for example,

who shot Lincoln,

and I was also sent to meet
General George Washington

with the mission to
urge him to immediately

retreat his troops
from New York Harbor.

There was always sort of a
very expert educational session

where they would
sort of acclimate us,

so we'd understand what
was gonna happen next.

While some may
find Andrew Basiago's story

hard to believe,

during the Cold War, the
United States government

conducted numerous
bizarre experiments.

These programs involved
everything from mind control

to remote viewing.

What this story
really plugs into is

the widespread suspicion about
the military-industrial complex.

The idea that the military are

conducting experiments
behind our back,

and it's a widely held view that
governments around the world,

particularly the United States,

have been researching
time travel for a long time.

Andrew Basiago
insists that his story is backed up

by more than rumor and innuendo.

He believes that there's
photographic evidence

which shows that he
traveled back in time

to observe President
Abraham Lincoln

deliver the Gettysburg Address.

I traveled to
Gettysburg on the day Lincoln gave

his famous Gettysburg
Address there,

which was November 19 of 1863.

My objective was essentially

watching President
Lincoln give the address.

But I was getting so
much attention by people

right up against the dais...

Some ladies from Gettysburg,

several Union officers
protecting Mr. Lincoln...

That I literally intentionally
walked away from the dais

and there I was photographed

standing by Lincoln
at Gettysburg.

Lincoln can be seen a
tiny, small image of him,

a few pixels, over
my right shoulder.

Now, it's called the
Josephine Cobb image,

because that's the photo
analyst at the Library of Congress,

Josephine Cobb, who
took a magnifying glass

and found Lincoln
in the photograph.

But the paradox of
time travel is such that

that photo was discovered

ten years before I
was born in 1961.

So when I left to go to
the Gettysburg Address

of Abraham Lincoln, that
photo of me in Gettysburg

in 1863 already existed.

So that's a proof of Pegasus,
and there have been many.

Time travel technology,

the best I know because
of my experiences,

is presently controlled by
the United States government.

It's not a tall story or
some kind of urban legend.

It's part of American
history that's been forgotten.

So, what do you think?

Is the boy in that
photograph a time traveler?

And if time travel
technology really exists,

then how has the government
kept it hidden for so long?

Perhaps clues can
be found by examining

another secret time machine,

one that is said
to be locked away

deep within the
Vatican Archives.

Beneath the
heart of the Catholic Church

lies one of the most
secure vaults in the world,

the Archivum
Apostolicum Vaticanum,

or as it's more commonly known:

the Vatican Secret Archives.

Underneath the Vatican is

a fortress that's
climate controlled

with state-of-the-art
security and technology.

In those archives are
over 50 miles of shelves.

Within those archives are
books, documents and artifacts.

But also rumored
to be down there are

the most mysterious
relics in history.

The Ark of the Covenant
is alleged to be down there.

The original Menorah could
be down in the archives.

The Spear of Destiny is
rumored to be down there.

And these are just
parts of the legend

that have kind of
accumulated over the years.

Whether or not
the Vatican Secret Archives

really contains lost treasures,
like the Ark of the Covenant

or the Spear of Destiny,
is a matter of debate.

But there is another
item supposedly hidden

within the archives that
some researchers believe

is just as extraordinary.

It's a time machine,
developed in the 1950s,

known as the chronovisor.

The chronovisor
is described as a machine.

You've got "chrono"
which means "time,"

and you've got "visor"
which means "vision."

So this is a device that
allows you to see through time.

The scientific
principle behind the chronovisor,

is that this is a device
that you could actually see,

sort of like with a hologram
or a television screen,

past or even future events.

So, rather than
risking a person's life

sending them into
the past or the future,

you could turn this device on

and see what had
actually happened.

Could there
really be a time machine

hidden within the
Vatican Secret Archives?

The story was exposed
on May 2, 1972,

in an Italian newspaper called
La Domenica del Corriere.

Journalist Vincenzo Maddaloni
wrote about both the existence

of the chronovisor
and the grand architect

of this astonishing machine.

The original idea for the
chronovisor came from

a Benedictine monk by the
name of Pellegrino Ernetti.

This was a gentleman who
was a scholar of archaic music.

He was also a physicist.

Ernetti developed
the chronovisor

sort of on accident.

According to Father
Ernetti, he had been working

for the president of
the Pontifical Academy

of Sciences, Father
Agostino Gemelli.

They were working on a project

to go through, restore and
archive old audio recordings,

um, mostly of Gregorian chants.

So, one day he's going
through recordings of the chants,

and Father Gemelli
swears he can hear a voice

on the recording, so
they isolate the voice.

And Father Gemelli
could swear that it's his father's voice,

but his father had been dead
at the time of this recording.

Now, Father Gemelli
thinks it's a miracle.

The voice under the chant
from beyond, it's a gift from God.

Father Ernetti's more
scientific, he's more grounded.

He wants to see if maybe
there's a way to extract

old information out of
electromagnetic recordings.

Father Ernetti
gets 12 physicists and scientists

together to help him
work on this project to see

if they can replicate
this phenomenon,

and they built the device.

Rumors about the
Vatican's secret time vision technology

were a strange curiosity in
Italian newspapers for decades.

But then in the year 2000,

the story was exposed
to the wider world

in an explosive book titled
Father Ernetti's Chronovisor.

The book included
firsthand accounts

from Father Ernetti
in which he revealed

how the device worked.

Father Ernetti said that
the chronovisor consists of

metal of different alloys.

Some rare metals, some
expensive, some exotic.

And these metals are designed
to tune into different frequencies

that pick up this residual
electromagnetic energy,

that sense conversations and
can see images anywhere in time.

The theory was that
energy never completely disappears,

that the past... the frequencies

are still floating around
out there somewhere.

And with the proper tuning,
you could actually pull in

the sights and
sounds of past events.

After building the
chronovisor, Father Ernetti claimed

he first tested its abilities
by watching speeches

delivered by Italian
dictator Benito Mussolini

just a decade
earlier in the 1940s.

When that test was successful,

Ernetti reportedly
scanned back to 1797...

to watch
Napoleon conquer Italy

during the French Revolution.

And despite intense scrutiny,

Father Ernetti never
changed his story.

Father Ernetti
passed away in 1994.

And to his dying day, he
said the chronovisor exists.

Over the years, the
Vatican has been questioned

about the chronovisor,
and their standard answer is:

it's fantasy, it doesn't exist.

But in 1988, allegedly,
there was a decree given

by the Church, which
was very, very strange.

And it said something
to the effect of

anyone using technology to
listen to or peer through time

would be excommunicated.

Why would the
Vatican make this declaration

if the chronovisor
doesn't exist?

And if the Vatican possesses

such an incredible
piece of technology,

then why are they hiding
it in the Secret Archives?

If you could turn on a
device and look any place,

any time in the past,

history would unfold before us.

All mysteries would be revealed.

However, such a device
would also eliminate all secrets.

Would our society be
mature enough to accept

the loss of our secrets?

I don't think so.

If the claims about the
chronovisor are true,

then maybe it's best
to keep it locked away.

But with reports of numerous
time machines circulating,

perhaps the more
important question is,

what's the science behind them?

The answer may lie

in the story of a
renowned Italian physicist,

who made a major
discovery related to time travel

in 1937, and then
mysteriously...

vanished without a trace.

Scientists at the
CERN Large Hadron Collider

announce a remarkable discovery.

After firing subatomic particles

through the 17-mile
length of the collider,

they observed that certain
particles, known as neutrinos,

moved faster than had
ever been measured before.

At the microscopic level,

neutrinos, very
exotic particles,

were clocked traveling
faster than the speed of light.

Now, if you could go faster
than the speed of light,

time travel may be possible.

But is it possible in principle,

to have these things happen
for large objects like us?

And the answer
is, theoretically, yes.

Could studying
high-speed neutrinos

be the key to understanding
how humans can move

faster than the speed of light,

and potentially even
travel through time?

Well, some say that
the answer may lie with

the peculiar disappearance
of a scientist in the 1930s

named Ettore Majorana.

Who came up with
this theory of neutrinos

that are being studied?

It was Ettore Majorana.

In 1937, this genius,
he wrote the first paper

on neutrinos, which we're
now studying decades later.

So because of Majorana,
we have a much richer

understanding of
subatomic particles.

Ettore Majorana
was living and working in Italy

under the dictatorship
of Benito Mussolini

in the lead-up to the
Second World War.

His work on neutrinos was
completely groundbreaking,

and then he just vanishes.

The fate of Ettore Majorana is
a complete mystery to this day.

He was, on the island of Sicily.

And this was in 1938.

He had a ticket of
a boat trip to Naples,

which it would seem as if
he actually got on this boat,

and then he just
disappears completely.

Many believed that
suicide was a rational explanation,

but there was no proof.

It seems inexplicable
that a man like Majorana,

very much at the
top of his game,

recognized as one of
the world's top physicists,

why would he suddenly
choose to end his own life?

Others believe that
he went to a monastery,

that he secluded himself away,

because he'd also withdrawn
a huge amount of money

from the bank.

But more intriguingly
is the notion that,

some people believe, that
the discovery of neutrinos

by Majorana also permitted him

to entertain the
notion of time travel.

Is it possible
that Ettore Majorana didn't

merely disappear but actually
used his knowledge of neutrinos

to travel through time?

Majorana left behind a
letter that may offer a clue.

Before his disappearance,

Majorana wrote
a series of letters.

And there's one
particularly intriguing letter

where he says that he will keep

a fond memory of his colleagues

"until 11:00 p.m. tonight,"

and possibly later.

And the tone and, more
importantly, the tense

in which he was
writing those letters

seemed to be very
vague in terms of time.

While skeptics have questioned

whether Ettore
Majorana's disappearance

involved time
travel, in the 1950s,

surprising evidence emerged

which suggests
that it could be true.

In 1955,
somebody actually meets a man

in Buenos Aires in Argentina,

that claims to be, um, Ettore.

So, with this, what
are we to conclude?

After Majorana's disappearance

there were frequent
Majorana sightings.

People coming forward to
say, "I think I saw somebody

who looks a
little bit like him."

And then a photo
surfaced from 1955

taken in Valencia, in Venezuela.

In this photo, there is a man
who is most likely Majorana.

Further
analysis of the photograph

revealed a bizarre twist.

Majorana was 32 years
old when he disappeared.

In 1955, he would've been 49,

but the man in the
photograph looks closer to 70.

So, where and when
was Majorana all that time?

Now, if that photo
was of Majorana,

it suggests not only that
he survived the ferry trip

between Naples and Palermo

but that he engaged
in some kind of travel.

Travel across space but also
possibly travel through time.

Did the man who unlocked
the secrets of the atom

also discover the
key to time travel?

It's unclear, but some
researchers believe

that you don't need
to be a brilliant scientist

to travel through time.

Instead, they argue that
there are certain locations

on our planet in
which strange energy

can transform an ordinary
person into a time traveler

by sheer accident.

This historic
port city is famously known

as the hometown of The Beatles.

But over the
years, it has gained

a much stranger reputation.

It's said that in Liverpool

time moves in mysterious ways.

And it's become ground
zero for a phenomenon

known as "time slips,"

which are a kind of
accidental time travel.

In Liverpool,
there's a shopping street called

Bold Street, which has
become infamous for time slips.

One of these time slips
involved a police officer

called Frank, who
was out shopping

with his wife
Carol, in July 1996.

And Carol went to
the Dillons bookstore,

and he went to a
shop to buy a CD...

A compact disc...
1990s technology.

Now, he then returned
to meet up with his wife,

but the bookstore
where his wife was,

Dillons, had now become Cripps

and was selling women's
clothing and handbags.

Now, this confused Frank, who
then looked around and found

that everybody around
him was dressed inexplicably

in 1940s, 1950s fashion,

and he became rapidly aware

that he was no
longer in the 1990s.

He was somewhere
very, very different.

And everything then
just changes back to how it should be.

The bookshop is there,

which he knows to be Dillons,

but he remembered the name
of that shop and it was Cripps.

And there was, indeed,
a shop in the 1950s

at that location by
the name of Cripps.

Is it possible that there
are places in this world

where space-time works
differently to anywhere else?

While Liverpool
has become known for time slips,

this unique phenomenon
has been experienced

and reported all over the world.

Recently, time slips have
been entering the news.

The fact that here you
are at one point in space,

and then suddenly
time has a mistake in it

which allows you to
slip right through a crack

in the fabric of space and time.

There is a big
difference between a time slip

and the use of a time machine.

In a time machine,
you have control

over your comings and
goings along the timeline.

With a time slip, one
ends up in the future,

or possibly the
past, without any idea

of how you got there or
any control of being there.

Curiously, time
slips have also been reported

on the sites of
historic battlegrounds.

Another very interesting
account of a time slip

occurs in 1932.

When two journalists went
to the Hamburg shipyard

to cover a story...

A gentleman by the
name of J. Bernard Hutton

and another gentleman
by the name of Brandt...

Nothing out of the
ordinary took place,

until suddenly they found
themselves in the midst

of bombs being
dropped all around them.

They could see, actually,
bombs falling out of the sky.

And obviously this was
something that terrified them,

and they got out
of there quickly.

When they looked
back from Hamburg to the shipyards,

they appear to be
intact and unharmed.

And when Brandt's
photographs were developed,

again, there was no
damage to the shipyards.

Fast-forward to 1943,

and Hutton was living in Britain
during the Second World War.

He read a report of an
RAF raid on that shipyard,

a bombing raid by
the Royal Air Force,

and the description in the
newspaper matched exactly

what he'd seen
on that day in 1932

and chilled him to the bone.

If there is some
truth to these time slip reports,

then what could be causing them?

Well, according to
physicists, the answer could be

that we're living in
what's referred to

as the multiverse.

The idea of the multiverse
comes from the quantum theory.

You know, when we were
children, we were told that

you cannot be two
places at the same time.

That's just common sense,
right? Well, we lied to you.

In the quantum theory,
electrons can, in fact,

be two places at the same time.

Therefore, we have this
scenario where the past,

the present, the future
are all mixed up into one.

So in principle, the
theory allows you

to simultaneously exist
with somebody from the past.

What are we to
make of people coming forward

and claiming these time slips,

whether they be into
the past or into the future?

And I think what we can
say is that there are so many

of these stories that there must
be some kind of truth to them.

But if numerous people
have been transported to another time,

then where is the proof?

The answer may lie in
examining old photographs

that curiously appear
to show people

from the future.

The Virtual Museum
of Canada releases a collection

of historic images
on its website.

One particular
photo, taken in 1941,

sparks intense curiosity,

because it appears to show a man

from the future.

In this image from 1941,
here we have a group of people

at the opening of
the South Fork Bridge

in British Columbia that year.

And this young man
just shouldn't be there.

Now, they all look like
typical 1940s people,

except for this chap
here with the dark shades.

He looks like a kind
of hipster from our time.

He's got his great,
cool sunglasses.

He's got what seems
to be a modern T-shirt on

and this little box camera.

There is no reason for him
to be standing there in 1941.

The bizarre photo
quickly went viral on the Internet,

and many have wondered
whether the strangely dressed man

could possibly
be a time traveler.

But according to some
researchers, the best evidence

of modern people
traveling back in time

is not a picture but rather
a mysterious artifact.

An archaeological
report came out in 2008

regarding a very,
very strange discovery

in a Ming dynasty
tomb in Shanxi, China.

Now, this tomb is at
least 400 years old,

and it was fully sealed,
hermetically sealed,

so no one had been
in it for 400 years.

But when they cracked
open this bit of rock

that had hardened over
time, this ring came out.

Just a few centimeters wide.

And on it, it looked
exactly like a watch.

It even had the
hands of the watch

and the 12 hours
around the edge,

which caused a sensation
because this couldn't have existed.

There was no
watches at this time.

So how could this be?

How could this anomalous ring
end up in a Ming dynasty tomb?

While skeptics
dismiss the unusual artifact

as a mere hoax,

others are thrilled by the
idea that time travelers

may be leaving tangible evidence
of their journeys to the past.

And yet, experts warn that
even though time travel is

a fun and fascinating concept,

it's also cause
for grave concern.

We have to realize that
if we can travel back into the past,

the worst-case scenario is
that governments could use it

to attack their enemy
by going to the past.

Imagine, for
example, going back to

to the Revolutionary War

and making sure that you
eliminated George Washington.

These are problems
that could happen.

This sort of technology would
be a very powerful thing to have.

For over 100 years,
we have been debating

whether or not time
travel, especially to the past,

is beneficial or dangerous.

But, of course, the dilemma for
us is, there's a conundrum here.

Because if there are people
time traveling and altering the past,

they will know
what they've done,

but we won't know
because we're living here,

and we haven't traveled back.

We're prisoners of time.

And, of course,
that's very unnerving.

The stories of supposed
real-life time travel

are tantalizing, provocative,

and in some cases dangerous.

They all teeter on the
edge of science fiction

and science fact.

Will we one day uncover
indisputable evidence

which proves that
these incredible tales

are actually true?

It seems that
only time will tell.

But until then, these
mysteries will remain...

unexplained.

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