All language subtitles for the.unxplained.s04e03.1080p.web.h264-spamneggs.3

Massive structures

lost beneath the waves
for thousands of years.

Sunken continents

that were home
to advanced civilizations...

and a remote mountain lake
filled with gold treasure.

For as long as
man has roamed the Earth,

we've also explored
the world's oceans

in order to find out
what lies below.

Is the planet's vast underwater
world hiding profound secrets

in the silent expanse
of cold and darkness?

What can the depths of the sea
tell us about our human nature

and perhaps
a lost human history?

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

Billionaire and underwater
explorer Victor Vescovo

boards an advanced
deep-sea submersible

known as the Limiting Factor

and descends underwater.

His mission is to explore
the Challenger Deep,

an underwater valley that is
the deepest point on the planet.

I was the fourth person to dive

to the bottom
of Challenger Deep.

Within the first
thousand meters,

it goes from being brilliant
sunshine in the Pacific

to pretty much fully black.

So you descend in the water
column, as we call it,

for up to four hours,

steadily going down, watching
that depthometer creeping,

creeping, creeping.

And you get to the bottom
and then you

check in with the surface,
tell them that you're ok.

At that point, it takes seven
seconds for the transmission

to actually get to the surface

and seven seconds
for it to go down.

It's such an incredible
feeling of relief

and a sense of incredible
achievement that,

"Oh, my gosh,
we actually did it."

Challenger Deep

is the most deep, dark and
dangerous place on the planet.

When you get to the bottom,
the pressure is

the equivalent of having

200 747s stacked on top of you.

Unimaginable
crush pressure there.

You need a properly
engineered submersible

that can go down,
withstand the pressure,

stay down there,

and continue
to explore these depths.

To get to these locations,

it's an extraordinary
undertaking

and it should be celebrated.

They are incredibly
difficult to get to,

they're extremely dangerous,
they're very hostile to people.

We don't belong down there.

The ocean is a vast expanse

that is almost
unimaginable in scope.

And although humans
have been traveling

across the high seas
for thousands of years,

we still only know
a fraction of what lies

beneath the waves.

The most important thing I think

I try to get people to realize
is that the ocean is big.

I mean, really big.

Bigger than you can
put your head around.

It is 70% of planet Earth.

And it's three-dimensional.

It's not a two-dimensional
surface like the land is.

And so, 80% of it
is still completely

unmapped and unexplored.

The deep sea

remains the last great frontier

for us as a species.

We know way more about
the surface of the Moon,

way more about the
surface of the other planets

than we do the deepest spots

in the ocean.

It's a mystery we've
just started to unravel.

The allure of the deep
sea is that it holds something

in everyone's imagination.

Not fully knowing what is there

enables everyone to come
up with their own vision

of what might be there.

What creatures
might live down there?

Might there be
sunken ships and gold,

and where might that be?

That is what
sparks the curiosity

that we need to keep exploring

and to keep investigating
what's down there,

what's out there.

The recent dives
to the bottom of the ocean

have shed new light into
the darkness of its depths.

But these voyages are just
the latest chapter in mankind's

long quest to uncover what
secrets are held in the seas.

In fact, our fascination
with the ocean

goes back thousands of years.

Throughout history

and cross-culturally as well,

we see a really
consistent pattern of belief

that under the water is
an entirely other world...

full of creatures

like a Kraken or a Leviathan.

And it's not just oceans.

Lakes are always populated
with these monstrous creatures,

like the Loch Ness Monster.

The message we get

is that no body
of water is safe.

The understandings
of the seas and oceans over time

has changed dramatically.

The ocean was basically seen

by seafaring people, like
the ancient Greeks were

or ancient Phoenicians were...

as the big, bad black sea.

They didn't have the ships

to go against the
currents and the winds.

And if you sailed
far enough, you'd die.

For so long, no one really knew

what the extent of the oceans
were, what's under them.

Even in the time of
Columbus, late 15th century,

people were worried,

some people thought
the Earth was flat,

that you could literally
get to the end of the ocean

and fall off the edge.

Humanity has always been
humbled by the vast power of the ocean.

But during the scientific
revolution in the 16th century,

we started to get a
better understanding

of the underwater world.

In 1521, Portuguese
explorer Ferdinand Magellan

attempted to measure the depth
of the ocean by attaching a line

to a cannonball and tossing
it over the side of his ship.

After lowering the
cannonball 2,400 feet,

Magellan declared that the
ocean was immeasurably deep.

Magellan went out and tried to
measure the depth of the oceans.

He wasn't largely
successful with that,

but it sort of
opened the door that,

wow, this is really deep

and we need to do
more exploration.

That was furthered later

with the HMS Challenger
expedition in the 1870s

that went all the
way around the world

to explore the deep oceans.

And the most significant thing
it found was the deepest part,

which is the Challenger Deep,

which was named
after the expedition.

Over time there became more
of a curiosity to the oceans.

To want to go down and
to be able to go down to,

to see what was there.

In the 20th century,

the development of
undersea submersibles

ushered in a new era

of unprecedented
underwater exploration.

The evolution of a
deep ocean submersible started

in 1930 when a
bathysphere was created,

where a man was put inside
of a, essentially, a vessel...

and dipped down into
the ocean held by a tether.

That was furthered later

by the bathyscaphe in 1960,

the Trieste, which took Don
Walsh and Jacques Piccard

to the bottom of
the Challenger Deep

for the first time ever.

Today, underwater
archaeologists and explorers

are using the latest
submersible technology

to try to unravel
the mysteries that lie

within the ocean.

And many experts believe

that they are on the
cusp of making dramatic

new discoveries on the seafloor.

My hopes for
ocean exploration in the near term

is to bring the
very deep places,

the very dangerous places
to a point of accessibility

where we can take any
scientists down to them

to explore them.

Also, there's a huge
project underway

called the 2030
Seafloor Initiative,

where a bunch of
different scientists

and people like myself,

we're trying to help
map the seafloor.

The Seabed 2030 Initiative

is gathering information
collected all over the world

by science vessels,

merchant ships, and
underwater drones.

Their goal is to map
the entire ocean floor

by the year 2030, a feat
that seemed impossible

for most of human history.

Technology is always the key.

Technology allows us

to do things that
we couldn't do before

and see those things that
no one has ever seen before.

It's human progress

and really pushing
ourselves to the next level.

It's really quite extraordinary
that we have the ability

to journey to the very
bottom of the ocean,

and scientists are making

incredible underwater
discoveries all the time.

For instance, a new
landmass was recently found

off the coast of New Zealand.

And there are those who
believe that it could be

part of a lost continent.

A team of
geologists at GNS Science

announce a major discovery

related to the
Earth's continents,

the vast landmasses that
make up the planet's surface.

The scientists found that,

in addition to the
seven continents

that humans have
known about for centuries,

there's also an eighth continent

located directly
underneath New Zealand,

which they named Zealandia.

Zealandia sank into the ocean

approximately 50
million years ago,

and its existence suggests

that there may be even
more lost continents

that were swallowed
up by the sea.

The Earth has cycles of sea
level rise and sea level fall.

Over the last hundreds
of millions of years,

as climate has warmed
we get sea level rise;

cold periods, sea level fall.

There's a huge amount
of land which is now

covered by the sea.

10,000 years ago,

with the end of the Ice Age,

sea levels were dramatically
lower than they are now.

And because of the melting

of the ice, sea levels
have risen since then,

and cities that may have
existed thousands of years ago

could be lost in history
as a consequence.

For thousands of
years, cultures from around the world

have told stories about
long-lost continents

that were home to
human civilizations

and are now submerged
beneath the waves.

Perhaps the most famous
is the legend of Atlantis,

a massive island that was
home to an advanced civilization

before it supposedly sank into
the ocean after an earthquake.

There's been
more books written about Atlantis

than any other lost
continent in history.

There are many

sunken cities, lost lands,

destroyed continents
all around the planet

in legend and history.

For example, we have
the lost land of Hy-Brasil,

which was thought to be

200 miles off the
coast of Ireland,

and it was even on
maps until the 1800s.

One of the most
intriguing lost continents is a landmass

that is believed to have once
existed in the Pacific Ocean.

A mythical land
that is known as Mu.

The first person
to write extensively

about the lost continent of Mu

was a Scottish writer

by the name of James Churchward.

In the 19th century, he
was in India when he visited

a monastery.

And the monks there had
records, apparently, tablets

that referred to
this place called Mu

that was this huge continent
that supposedly existed

from Hawaii in the north

down to Easter
Island in the southeast,

right the way across to
Micronesia in the west.

And the people there were
supposedly called the Naacal.

The continent of Mu thrived
perhaps 50,000 years ago

and was sunk beneath the waves,

possibly at the end
of the last Ice Age.

My great-grandfather
James Churchward,

eventually he became friends
with the rishi of the temple

that he visited in India.

And the rishi mentioned
that he was a member

of the Naacal brotherhood,

the holders of
wisdom and knowledge

of the lost continent of Mu.

They were mighty
navigators and sailors

and established civilization
in other parts of the world.

According to James Churchward,

the Naacal civilization
had a population

of more than 60
million people at its peak

before a massive volcanic
cataclysm caused Mu to vanish

beneath the waters.

So far, no evidence
of the lost continent

has been found
on the ocean floor.

But some researchers
claim that, incredibly,

a tiny remnant of Mu may
still exist above water today

on an island located in a
remote part of the Pacific Ocean.

Roughly 2,500 miles
northeast of Australia

lie the ruins of a
once great ancient city.

Nan Madol.

Nan Madol is a complex
of man-made islands

built with massive stone
blocks that float atop

a submerged coral reef.

So as you approach Nan Madol,

there are a series of islands,

and they're built
actually on coral,

the only place in the world
where this actually occurs.

And you've got all these
incredible structures

made of these prismatic blocks.

At Nan Madol, you have these

ridiculous basalt
columns, they're huge,

some of them up
to, like, 40 tons,

even more in some cases.

Some of them are raised
very high up in the air,

on the very top levels.

So there's a real problem when
it comes to try and understand

how they moved these millions
of tons of basalt columns.

One of the biggest mysteries

surrounding Nan Madol

is that nobody really
knows who constructed it.

But there's some
very strange stories

about how the city
came into existence.

For instance, one of
the stories talks about

it being constructed by
so-called master builders...

turning up and
using a magical force...

to raise the blocks into the
air and put them into place,

almost as if they could
levitate these blocks.

Some people actually suggested

that maybe Nan Madol
was the last remnant of Mu

that was still above water...

and it was simply

indicative of what had sunk

beneath the waves from
this advanced civilization.

Nan Madol is in Micronesia,

so it fit the correct
general area.

And this is one reason
people thought in terms of Mu.

When it comes to
looking for this lost continent of Mu,

places like Nan
Madol really do suggest

there could be much more
down there than we realize

on the bottom of the ocean.

It's hard to picture
an entire continent,

with people living on it,
simply vanishing into the sea.

And yet...

all over the world,
there are legends of lost

civilizations that were
swallowed up by the oceans.

But could such
legends actually be true?

Perhaps the answer can
be found by examining

a mysterious structure
located in the Pacific Ocean

that has come to be known as

Japan's Atlantis.

At the western
end of the Pacific Ocean,

67 miles off the
coast of Taiwan,

is the Japanese
island of Yonaguni.

It is one of some
6,800 landforms

in the Japanese archipelago,

a chain of small islands

located near the
southern tip of Japan.

But just off the
coast of Yonaguni lies

a mysterious complex of
underwater stone formations

known as the Yonaguni Monument.

It's an absolutely
incredible structure,

and it looks like
a giant staircase.

Steps in the
bedrock with terraces.

The symmetry and the
regularity that people see on it

just makes a
astounding impression.

It looks like a huge,
multifaceted pyramid platform

that stretches over a huge area

with all these
details carved into it.

There's areas where monoliths
were said to have been standing.

There's even dolmens
or large slabs like lintels

covering areas and creating
doorways and other features.

When you look at
some of the rock structures,

it looks undeniably man-made.

But with that comes a
whole series of questions.

How did it get here?
How long has it been here?

What is the structure
you're looking at?

The Yonaguni Monument
was discovered by divers in 1987,

and since that time,

experts have debated
whether it's a natural formation

caused by erosion
or an artificial structure

that was carved by
man in the distant past.

Researchers who believe
that the monument is man-made

claim that it is the ruins

of a massive stepped
pyramid complex

that is nearly 500 feet long,
130 feet wide, and 90 feet tall.

The Yonaguni Monument
was originally above water,

but at some point in the past,

waters rose up and covered it

and it's now beneath
almost 100 feet of water.

You have not only these
geometrical structures,

these terraces,

but also some strange monuments,

including what appears
to be this human head.

It's 23 feet tall

and it has these
hollow sunken eyes.

It almost looks like the
moai statues of Easter Island.

It looks hauntingly like

some kind of giant of the past.

Underwater
archaeologists who have visited Yonaguni

have also noted that
there appears to be

a sculpture of a sea turtle.

And some even claim
there is a carved roadway

circling the entire site.

There's so many elements to it

which suggest it's at least
been manipulated by man,

because it looks like it's
been carved from solid rock.

And one of the theories
that has kind of caught

many researchers' attention
is that it could be evidence

of a lost civilization many
thousands of years old.

Some people
have thought of Yonaguni

being "Japan's Atlantis,"

in the sense that if
Yonaguni is an artificial,

human construction
from very ancient times,

it must represent the tip
of the proverbial iceberg

of an advanced civilization

thousands of years ago
that somehow disappeared

into the ocean under the waves.

Is the Yonaguni Monument

the remains of a
lost civilization?

And if so, how long ago
did that civilization exist?

One of the
really, really interesting,

mystifying things about
the Yonaguni Monument

is the depth of water.

So, it's 25 meters.

Now, if we were relying on
the pulses of sea level rise

from kind of the
end of the Ice Age

10,000 years ago, that means
that the Yonaguni Monument

would be 12,000
to 14,000 years old.

That's going to predate

the earliest civilizations we
know of by 7,000 years or so.

If the Yonaguni Monument
was man-made, then it is a truly

seismic discovery in terms

of the history of our
species because,

potentially, the cradle of
human civilization was Japan,

was off the coast of Japan.

Is it possible
that the Yonaguni Monument

is not only man-made

but also much older
than any other ruin

that's ever been discovered?

Many scientists believe

that further research on
this remarkable structure

could rewrite history

and offer tangible evidence
in support of the theory

that there are remnants of lost

civilizations hidden
in the world's oceans.

Are there
some foundational cities

underneath the water?

I wouldn't bet against it.

If we want to unlock the
secrets of ancient civilizations,

we may very well
have to look underwater.

What we are beginning to learn

is the huge potential of

mysteries in the sea, as
in what the sea can give us

in terms of new discoveries,
new glimpses into other worlds.

And the Yonaguni Monument
is a real manifestation of that.

The mere possibility

that the ruins of an
ancient civilization

could be lying on the
floor of the Pacific Ocean

is fascinating.

But our next underwater mystery
can be found not in the ocean

but at the bottom
of a vast lake.

A lake that holds gold and
silver artifacts that date back

thousands of years.

High atop this
5,500-mile-long mountain range

lies Lake Titicaca,

one of the most picturesque
bodies of water in the world.

Lake Titicaca sits at
a remarkable elevation

of 12,500 feet, which is roughly
two miles above sea level.

Lake Titicaca is a massive lake

in the midst of a
mountain range,

and it's about 120 miles long

and 30-some miles wide.

It extends down
nearly a thousand feet,

and it's the highest
navigable lake in the world.

It's quite unusual
to be on something

that looks like a
sea when you're on it

and see snowcapped
peaks... surrounding it.

You might
think that a lake located

at such a high and remote
location would have no traces

of human activity.

But what's incredible

about Lake Titicaca
is that, for decades,

archaeologists have been finding

mysterious gold
artifacts submerged

within its icy waters.

Excavations
of Lake Titicaca found

2,000 artifacts of
gold, silver, and pottery.

Normally, of course on land
you would find that, but to find it

in the lake was very
mysterious and surprising.

There's more
than 40-some carved stone boxes

that have been found.

Many of them have little
grooves in their sides,

which was where the ropes were

tied around them so
they wouldn't slip out

when they were being
lowered into the water.

Now, the exciting thing
about finding these boxes

with a lid is the kinds of finds
that were being made in them,

such as a gold vase,

a gold medallion,

and gold feline figurines.

But why would the
ancient peoples of this region make

a difficult trek to this
lake that is located atop

one of the least accessible
mountain ranges in the world

to leave so many gold artifacts

at the bottom of the lake?

This entire area of the Andes
is associated with the Inca.

And they are responsible
for many of the finds

that have been
made in Lake Titicaca.

The Inca were a South
American civilization

that controlled 2,500 miles

stretching all the way from
Peru, modern-day Bolivia,

Guatemala into
Chile and Argentina.

Lake Titicaca was
one of the most sacred places

in the entire Inca Empire.

It was sacred because it was

one of the most important
freshwater bodies of water

in all of South America.

When the Inca
realized the incredible value

of the Lake Titicaca basin...

they initiated a program
of religious pilgrimages,

essentially, saying that

their key creator god,
known as Viracocha,

rose up out of the
waters of Lake Titicaca

to create all humanity.

Lake Titicaca

is the mythological origin

of the entire Inca Empire.

They believed that they were
descendants of the cultures

that had evolved
at Lake Titicaca.

There were legends
of temples and whatnot

underwater in Lake
Titicaca, long before the Incas.

According to Inca legend,

a civilization that existed
centuries prior to them

rose from the waters
of Lake Titicaca.

Remarkably, archaeologists
have uncovered evidence

which suggests that there
may be some truth to this myth.

In August of 2000, an
Italian team of divers

uncovered traces
of a paved road,

a stone terrace,

and a wall nearly
a half a mile long.

They found themselves
swimming along what looked to be

an ancient paved roadway.

And they passed what
looked like it could have been

terraced agricultural fields

quite similar to
what you can see

around the shores
of the lake even today.

But what they found
at the end of this road

really astonished them.

It was a giant temple complex,

the size of two football fields.

Archaeologists were
able to see that these were

extremely ancient,
1,000 to 1,500 years old.

We found artifacts

dating from around 300,
400 AD, until about 1100 AD.

And then you have the Inca
coming in around 1400 AD.

So that means that Lake Titicaca

was a sacred
place to civilizations

that dominated the
Andes before the Incas.

The ruins found at the
bottom of Lake Titicaca would seem

to validate the Inca belief
that there was another culture

present there long before them.

But how did these ruins
become submerged?

We've got
these structures underwater.

They're 1,500
years old or older.

It's one thing to find
artifacts underwater

and they may have been
dropped or may have been

purposefully, um, sacrificed
to the lake, if you would.

But when you find temples and
walls and roadways underwater,

you know that
something was going on

at a much earlier period.

Certainly they were not
building these things underwater.

We do know that Lake
Titicaca fluctuates in terms of

the water levels over time
over thousands of years.

So this is incredibly
important and fascinating

and it ties in with Inca beliefs

that they thought
this was a place

that was literally
the birthplace

of civilization for them,
up in the high Andes.

The enduring
mysteries associated

with Lake Titicaca would be,
for example, who was the first

civilization to live here?

We have no idea how far
back in time humanity goes

in terms of the first habitation
or inhabitation of this lake.

But that's why there should be
more underwater archaeology

done here in Lake Titicaca,

in order to be able to fully
comprehend the true history

of this amazing aquatic area.

What else might be submerged
at the bottom of Lake Titicaca?

Could there be other artifacts

that might change our
understanding of human history?

Well, the diving
expeditions continue,

as do the revelations.

But let's consider a different
kind of undersea discovery.

One that makes us
question not our past

but rather whether we're
alone in the universe.

100 miles
off the coast of San Diego,

a group of U.S.
warships are conducting

routine training exercises

when they detect a
number of unidentified

flying objects near
Catalina Island.

They were picking up multiple
targets on the radar system,

but they had a new
system they were testing.

So the theory was
that it was just glitches,

and so they rebooted.

But sure enough, these
targets showed up again.

And this goes on for
a series of some days,

and then they vectored
jets to go and investigate.

As Navy F-18 fighter
jets approach the area where the UFOs

had been detected on radar,

the pilots see a white,
oval-shaped object

that has no wings

and resembles a giant Tic Tac.

But then suddenly,

it rapidly descends 80,000
feet in less than a second

and hovers above the
surface of the water.

Naval Officer Ryan Weigelt

was stationed on the
nearby USS Princeton

on the day of the encounter.

I was called to the
bridge by the CO

and when I got up to the bridge,

the whole office was much more
crowded and chaotic than normal.

People were raising their voice

on seeing some of the
things that they were seeing.

It was a very
excited atmosphere.

I noticed that to
my left-hand side

was a video monitor
where the FLIR footage

was being fed
into the Princeton,

so I could see what
the jets were seeing.

On my right-hand side

I am watching them
on a radar screen

that gives
information on altitude

and speed and heading and...

Seeing what I saw,

it's impossible for anything
that we own or have created

to withstand the G forces
that would be created

from doing any type of thrusts,

like what this Tic
Tac was doing.

Two of the pilots involved
in the Tic Tac incident,

Commander David Fravor

and Lieutenant
Commander Alex Dietrich,

have stated that under
the infamous Tic Tac,

there was an area of
water that was roiling,

as if there was this
object under the waves.

And this object was about

the size of a Boeing 737.

Navy eyewitnesses

have reported that
the Tic Tac was moving

erratically above the
surface of the water,

as though it appeared
to be interacting

with the unidentified object
located beneath the waves.

Moments later, the Tic Tac

made a series of seemingly
impossible maneuvers

to evade the Navy jets
before accelerating away

at thousands of miles per hour.

And the pilots claim that when
they tried to get a second look

at the underwater object,
it had somehow vanished.

I am a person who needs to see

to really believe and...

seeing what I saw
during that time frame,

I think any rational-minded
person would be somewhat alarmed

that there is this
technology out there

that is far superior to us.

That technology
isn't something we have.

So, if not us, who or what?

And what we're hearing about
now is just the tip of the iceberg.

There have been
consistently a lot of reports

of unidentified objects
under the ocean.

People have seen
them from the shore,

going into the sea and
coming out of the sea.

We've all heard of UFOs
because they fly in our atmosphere,

but what happens if they can hit
the oceans and go underwater?

These are USOs.

Unidentified submerged objects

are objects that have
the ability to plunge

right into the ocean
and disappear.

This is something that
we cannot duplicate

with our technology,
and so these objects

are of very intense
interest because it means

that a new technology is being
harnessed by some unknown party.

They could be even,
perhaps, extraterrestrial.

Extraterrestrial USOs?

Flying into and out
of the world's oceans?

For some, that may
sound like something

out of science fiction.

But curiously,

more than a decade
after the Tic Tac incident,

the United States Navy
continues to detect USOs

off the coast of
Southern California.

In July of 2019, Navy
aircraft flying in the same area

recorded video
which appears to show

an unidentified flying object
disappearing into the ocean.

What's really
interesting about this

is that all this is happening

in a fairly small
geographical area.

So you've got a
series of encounters

happening off the
coast of San Diego.

To have all this going on in
one very concentrated spot,

one has to say, is
this just a coincidence

or is there a connection?

If there are, in
fact, extraterrestrial USOs

lurking in this area,

then where are they hiding
when they go underwater?

Satellite imagery
reveals a strange

underwater formation
only six miles off the coast.

The three-mile-long
anomaly lies 2,000 feet

below the surface
of the Pacific Ocean,

and the discovery
led many to wonder

if this formation
might actually be

an artificial structure.

A lot of people

got very excited
by this discovery.

It's really quite striking

and it really does
look artificial.

It looks like the thing's
got this huge flat roof.

It looks like it's got
pillars or columns.

And it makes you wonder,

is this the remains of
some ancient civilization

that's just hidden
by rising sea level?

Or is it, as some believe,
an extraterrestrial base?

If all these objects
are buzzing our aircraft,

they must have a
base of operations.

But you see, if they
have a base of operations

as easily detected by us humans,

it would sort of defeat the
purpose of observing us.

So perhaps there's
an underwater base

that is away from
prying eyes of humans,

so that we don't
interfere with their plans.

That cannot be ruled out.

Is it really possible

there are
extraterrestrial spacecraft

lurking in the ocean, as
members of the U.S. military claim?

As of now, we
can't say for sure.

But sometimes the ocean's
depths reveal evidence

which proves that an
incredible story is true.

Like off the coast of India...

where archaeologists
rediscovered

the ruins of a mythical

underwater city.

Perched on
the shore of the Arabian Sea

sits the modern city of Dwarka.

It was named after
a legendary city

that was also called Dwarka.

The sacred Hindu
text the Mahabharata

explains that the
legendary city of Dwarka

was said to be the dwelling
place of Lord Krishna

before it sank into the
sea following a fantastic

battle in the sky
between Krishna

and another Hindu
god Lord Salva.

For centuries that story was
believed to be merely a legend.

That is, until 1983

when underwater ruins
were discovered off the coast.

Ruins which suggest that
the legendary city of Dwarka

was not a myth but
rather a real place.

S.R. Rao

was an archaeologist,
a marine archaeologist

working with the
Archaeology Institute in India.

And he started the exploration

from the shore of
present-day Dwarka.

And on the floor of the ocean,

on the seafloor he
found wall structures,

blocks three foot by three
foot, probably a foot thick,

stacked as if they were building
continuous wall structures.

They could be city
walls, they could be street,

building walls, um, they
could be walls of temples.

The archaeologists
are now saying that they are perhaps

datable to 9000 BCE.

If it is true,

the archaeological
fact supports the story.

And that is what makes it
more interesting and more

significant, this discovery.

The discovery of
sunken ruins off the coast of Dwarka

is proof that underwater
exploration can turn some myths

into reality.

Many experts believe that
Dwarka is just the tip of the iceberg,

and that there are even more
secrets lurking in the deep

that could challenge

our understanding
of both our planet...

and human history.

The biggest unanswered question

regarding the oceans is,

now that we've opened this
door to this scientific exploration,

what can be found

that will have some
impact on our own lives?

Well, the oceans,
they drive weather

and regulate temperature

in ways that we don't
fully understand now,

and the only way that we're
going to completely understand

is to go down there
and to gather more data.

And that's just one example.

The ocean is constantly
throwing up surprises.

Will we find
remnants of an ancient civilization

that no one knew about?

I don't know, but that

unknown is what drives
me, because there's a chance

that we'll find
something revolutionary

at the bottom of the ocean

that no one had ever
thought of before.

Even though we are the first

generation ever to
explore under the sea

with any level of
technology and rigor,

the deep sea still eludes us.

And the good thing is,

it's becoming more
and more accessible.

Imagine what we can
discover in the next 50 years.

So, what do you think?

What still lies in the deepest,
darkest corners of the ocean?

Well, in spite of
everything we've learned

about the underwater world,

we simply don't know
what else is down there

waiting to be found.

And that mystery is what
compels us to keep diving,

to keep searching,
in the hope that one day

we will uncover all
the secrets of the deep that,

for the moment, remain...

unexplained.

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