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.
LYNNE Mc 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.
CAPTIONING PROVIDED BY A+E NETWORKS