Original subtitles

[suspenseful music playing]

[Patrick] This is the mother of them all,

I mean, it is the deepest of them all.

So, we've got a lot on the line.

We're going to be assaulting the challenger deep

with more technology and more capability

than anyone has ever done in history.

You realize how deep we are, right?

[Alan] Oh, my word, look at that!

It's going up!

[Victor] Oh! This is really hard.

[Alan] Whoa! Up, up, up up!

What the hell was that?

[machine beeping]

Got a big battery fault.

Surface, LF has lost power.

[suspenseful music playing]

[Demetri] Humankind has explored

every continent on Earth.

We've climbed its tallest mountains,

and even journeyed into space.

[man] Thank you, Mr. President.

[Demetri] But there's a vast swathe

of our own planet

that has remained a mystery.

The deep ocean.

Stretching down over 35,000 feet

into crushing pressures,

it's been near impossible to reach...

until now.

New engineering breakthroughs are driving

an audacious global mission

to dive to the deepest points

of all the five oceans,

for the first time in history.

These pioneers will push technology

to the limit...

[Patrick] What the hell was that?

We have leak in hatch

[Patrick] Oh, my God.

[Demetri] ...to open up this final frontier,

as never before.

[Cassie] Trying to like mentally put yourself

at the bottom is just mind blowing.

[Demetri] Mapping hidden landscapes

discovering unknown life forms...

[Alan] What on Earth was that?

[Victor] There is something there.

[Demetri] ...and unlocking the secrets

of how life in the extreme deep ocean

affects our entire planet.

[dramatic music playing]

[suspenseful music playing]

[Demetri] Ex Naval Commander Victor Vesco,

is now getting ready to face

the ultimate challenge of this expedition,

the deepest dive on our planet.

[Kelvin] Roger that. You are free to dive.

[Demetri] So far he's travelled 20,000 miles

half way across the world

and completed three record-breaking dives.

[Victor] And I just wanted to say thank you all

for getting us to this point.

It's been four years since we first started

thinking about this overall mission.

[Demetri] But now,

he will be pushed to the limit

by the largest and deepest of the Earth's oceans.

The Pacific.

[Rob] I mean, this is

the mightiest ocean of them all,

this is a third of the surface of our planet.

The Pacific Ocean is different than all the others

in that it has the oldest seafloor in the oceans.

It is just much deeper, much older ocean.

[Demetri] It is also home

to the deepest place on Earth,

the Mariana Trench.

[Victor] From a very young age

I loved just looking at atlases

and one of the most prominent features in any Atlas

is the deepest point in the world

which is the Mariana Trench.

This deep dark place,

of course it captured my imagination.

[Demetri] It's 8,000 feet deeper

than any dive Victor has attempted before,

and it will subject the sub to enormous pressure.

[Patrick] Just come up on the A-Frame.

Let me know when we're clear for straps, Kelvin.

[Kelvin] Yeah, we're clear for straps.

[Rob] It's as an extreme environment

as we have on planet Earth.

This is the major league,

you know, this is as difficult,

as technically challenging

as submersible diving gets on planet Earth.

[Demetri] The bottom of the Mariana Trench

has only been only visited by three people

and one of them is on board.

Okay, good. Thank you guys.

[Demetri] Captain Don Walsh.

In 1960 he and a fellow deep-sea explorer

took an experimental craft

to the uncharted depths of our planet.

[Don] I never had any fear.

Why have fear?

What are you gonna do about it?

You're committed.

You're gonna go down there as far as you can,

if something doesn't work, too bad.

And there's nothing you can do about it.

[Demetri] Fifty-two years later in 2012,

Don witnessed a solo dive by Hollywood director

and deep-sea explorer, James Cameron,

who recorded a depth

just 10 feet shy of Don's record.

[phone ringing]

[James] Hey, Victor.

Hi, Jim, how are you?

[James] Hi, good, good.

[Victor] It's great sitting next to the first person

to go down to the Challenger Deep

and it's just so wonderful

to be able to talk to the second person

and hopefully we can continue passing the baton.

[James] Yeah that's great.

I mean, you've really kicked the ball further

down field in terms of the technology.

And the only other piece of advice I would give

is give yourself a moment, stop,

and just look at the window

and just think about where you are

and what it means.

That's great, Jim.

I appreciate that.

[Demetri] But now,

Victor is on a mission to find a spot

even deeper than Don Walsh and James Cameron,

and break a record that has stood for 60 years.

[Cassie] We have one of the best sonars

in the world right now

and we're going to produce

the most accurate map of the Mariana Trench

that's ever been done before.

[Demetri] The deepest section of the Mariana Trench

is in a hollow known as the Challenger Deep.

But the team also want to take on

a deep ocean exploratory dive,

a hundred and forty miles east

in the Sirena Deep,

where no submersible has ever been before.

[Patty] So, the deepest part is right in here.

Nobody's been down there.

[Demetri] The team will be on the hunt

for vital new scientific data

that may help find alien life

elsewhere in our solar system.

Because there are frozen moons,

like Europa orbiting Jupiter,

that NASA believes could hold life.

Beneath the surface ice,

deep oceans might nurture organisms

able to exist in environments

as extreme as the Mariana Trench.

[Patty] NASA's search for life efforts

are looking for the limits of life.

They are very interested

in looking at the deep trenches

to see if microbes can live

in these most extreme environments on the planet.

[Demetri] If they can find colonies of bacteria

in the Mariana Trench,

then extreme forms of life could also exist

in the oceans of those alien moons.

The general conception I have for this dive

is that this is very much a science focused dive.

One thing that I am concerned about

and that's recovering the samples.

First priority is a rock with some stuff on it.

Fingers crossed.

Just be vigilant

as you're approaching the bottom.

That, that depth sounder,

once it starts picking up

and as you know Victor giving you

- reliable data... - Mmm-hmm.

...you gotta pay attention to it,

you can't ignore it.

I mean, I don't know if there's pinnacles

or haystacks.

Who knows what we'll find.

[Kelvin] We're gonna leave that one down.

[Demetri] Even though the dive is not the deepest

in the Mariana Trench,

at 35,000 feet

it will put the sub's engineering

under massive strain.

[Patrick] It's a substantial pressure,

so we've got a lot on the line.

We basically got all the poker chips

in the center of the table.

[Demetri] Chief scientist, Alan Jamieson

is joining Victor on this pioneering dive.

- Welcome back, sir. - Hello.

[Kelvin] LF, LF, SO.

[man] LF, LF.

[Kelvin] Hey, we're gonna go for release here.

We'll let the sub off the hook.

- Do it. - Perfect.

[Stuart] And we're currently

about 900 meters from the drop zone.

[Kelvin] Okay. Roger that.

[Patrick] We can tow him for a couple of minutes,

no worries.

[Stuart] Twelve, before a few minutes

until we're ready to let him go.

[Demetri] To dive Victor will pump water

into empty ballast tanks at the top of the sub.

But now the waves are picking up

and flooding them early.

[Rob] Seventy-five to go.

[John] They're spending a lot of time under the water.

The tanks are gonna be filling all the time.

[Patrick] Son of a [bleep].

[Frank] With that much weight on the sub.

That [beep] goes down quick.

[Rob] Fifty meters to go.

[Patrick] That's gotta be it.

We can disconnect now.

[Rob] Release, release!

[Patrick] It's tied off.

Get that [bleep] tow line.

[man] Grab on that tow line.

[Patrick] Get her loose.

[Rob] Release.

[Patrick] When those tanks filled up,

- she's diving. - [Rob] Release.

[Demetri] Swimmer Tim's got just seconds

to release the towline

and must avoid getting entangled

and dragged to his death.

[Rob] Release, release, release!

[suspenseful music playing]

[Patrick] Those tanks filled up.

She's diving.

[Rob] Release, release, release!

[Patrick] Come on, Tim, get her loose.

[suspenseful music playing]

[Tim] As I am taking handrails off,

I could feel the sub going out

from underneath me.

In a bit of a panic,

I tried to get out of there as quick as possible

to make sure I wasn't tangled up in anything.

[Demetri] On their way down,

Victor and Alan pass through

the top layer of the ocean,

called the Sunlight Zone.

Home in the Pacific

to one of the nature's greatest survivors,

the nautilus.

It's remained virtually unchanged

for half a billion years.

As the sub goes deeper, the light dwindles,

and they enter the Twilight Zone.

Here, out of the darkness emerges

one of the wonders of the deep ocean,

creatures that generate their own light.

[Alan] Wow, look at the bioluminescence,

can you see it?

- Yeah? That was great... - [Victor] Oh, that's so cool!

- [Alan] ...isn't it? - [Victor] Yeah.

[Alan] Bioluminescence is the most commonly used

communication on planet Earth.

In terms of the number of species that use it.

[Demetri] In the Pacific

the Twilight Zone holds

other extraordinary creatures

adapted to live in the gloom.

Like the Cock-eyed Squid.

Its larger left eye can pick out

camouflaged prey in the waters above.

While its smaller right eye points downwards

to spy any predators lurking below.

The sub is now passing 3,000ft.

Beyond here a US nuclear sub

would be crushed like a tin can.

This is the Midnight Zone,

where some of the most bizarre animals

on the planet are still being discovered.

This is a Gulper Eel,

which can detach its jaw

and inflate its body to swallow much larger prey.

[Victor] Somewhere between 3,000 and 6,000 years

just as the pressure decreases

the size of the sphere, it tightens

and it happens suddenly.

It makes a little wrapping noise

on the capsule,

it's a little unnerving.

We've been in the submersible now for...

three hours and nine minutes.

[Demetri] The sub is now

in the deepest ocean region of all,

the Hadal Zone.

And finally their goal is in sight.

[Victor] I can see it,

see it slowly getting lighter?

Eleven meters of the bottom,

we should see it very shortly.

Four meters off.

It's one meter off the bottom.

That's the bottom of the Sirena Deep.

Incredible.

[Victor] Surface, LF.

Surface, life support good at bottom.

Repeat, at bottom.

By the way, congratulations.

First man to descend the Sirena Deep.

As are you.

[Demetri] The sub is now

under some of the most extreme pressures on Earth.

Victor and Alan are the first humans

to see this unexplored landscape.

Now they need to look for communities of bacteria,

the kind of extreme life

that NASA might find beyond our planet.

[Lynne] Finding a microbe

in the bottom of the Mariana trench

is important to me

because deep at the bottom of the ocean

you don't have access to sunlight

and so these organisms have to use

some other source of energy other than sunlight.

[Demetri] Some bacteria have developed

to feed on chemicals seeping from the Earth's crust,

but none have been found in these extreme depths.

[Victor] What should I be looking for?

[Alan] You're looking for bacterial mats

of very distinct color.

[Victor] What do they look like?

[Alan] Some of them are white.

Some of them are really strikingly orange and yellow.

Okay. Your eyes are outside,

- I'm on the inside. - [Alan] Yeah.

[Victor] Been down here two hours, fifteen minutes.

- Already. - Yeah.

[Alan] How long do we have?

Yeah, we're below 50% on the batteries.

Oh, [bleep].

All right. stop, stop, stop.

What is that.

Woah, up, up, up, up up, up.

What on Earth is that?

[Victor] Is that a bacterial mat?

Look at that. Look, look.

[Alan] Yep that's it!

See the yellow?

[Demetri] The yellow growth on the rocks

is in fact millions of bacteria

feeding on chemicals

seeping from the Earth's crust.

And it's the deepest ever observed.

High five.

[Alan] I knew patience would reward us.

[Demetri] The team have visual evidence

of the kind of extreme life

that could exist in deep oceans

elsewhere in our solar system.

Now they need to bring back a first-ever

physical sample.

[Victor] The current is pushing us to the right,

it's heading it's... Woah! [bleep]

[Demetri] But now a strong current

is making this delicate task near impossible.

[Victor] Flying a submarine in a current with one hand

and trying to get a rock with a manipulator.

This is really hard.

Oh, my God, my heart is going faster!

Wow!

Let's give it one more try.

I got a [bleep] rock!

I got a rock!

I can't believe I got a rock!

It fell apart... Damn it.

[machine beeping]

- [Alan] What was that? - [Victor] The batteries.

We have been here three hours.

Okay. That's it, I tried.

All right. I'll drop the weights.

Surfacing weight, we're on our way.

I'm sorry, I didn't get a rock for you, doctor.

I tried, I tried like hell.

Surface, Surface, LF, how do you read?

[man] We got you, buddy, we are on the hunt.

[Demetri] The team failed to obtain a rock sample,

but as the sub comes back on board,

the crew make a surprising discovery.

[Shane] Holy [bleep].

[Patrick] Nice and easy, nice and easy.

[Demetri] After the first ever dive

to the Sirena Deep,

the team find an unexpected piece of evidence

inside one of the battery compartments.

[Patty] This is so cool

that you guys found this rock in here.

Can you show me where?

[Shane] Basically just down in the bracket there.

It was sitting on the flat spot.

- Ah yep, that makes sense. - Yeah.

- Okay. - Yeah.

The mud got us thinking, let's keep an eye out.

[Patty] This is great.

What a find.

This is the first rock

that has been recovered in the Sirena Deep.

[Demetri] Microscopic analysis of the rock surface

shows intricate bacterial growth.

[Lynne] For us as astrobiologists,

to know that there is life deep in the ocean,

gives us confidence when we start to look

at other places in our solar system,

that there are organisms that can survive

on another planet without sunlight,

and live under very high pressures.

At least we know it's possible

and it's worth going looking.

Wait. Hold on a minute. I'm gonna grab that line.

[Demetri] But now the team discover a problem

that could jeopardize any further dives

into the Mariana Trench.

One of the three navigational probes,

called 'landers', is missing.

Alan said that the one of them is still not

on its way up.

That means it must be stuck.

[Patrick] [bleep] me, man.

[bleep] lander stuck in the mud down there.

Bad news, man.

You know what you've got to do, don't you?

- [Victor] Go down and get it? - [Alan] Yeah.

[Demetri] To save the mission they must risk

an unprecedented deep-sea rescue.

[Rob] If we are able to actually rendezvous

with a dead target.

We are attempting the deepest salvage operation

that's ever been attempted by man.

So, no pressure.

The big challenge is to find the lander

that has now ran out of battery

so it's not able to signal to us where it is.

Once we find it, uh, with the sub

the sub will need to either work it loose

by using the manipulator to free it.

If it needs to remove the weight from the bottom

it will need to put the manipulator arm in underneath

and cut the wire that's attaching the weight

to the lander itself.

[Demetri] At the helm of this risky operation,

Victor puts one of the most experienced sub pilots

in the world, the builder of the sub itself,

- Patrick Lahey. - [Patrick] If we find it

we are going to try and get it off the bottom.

You know, whatever it takes we'll release it.

[Demetri] But grappling with the lost lander

holds a terrifying danger

of the sub itself getting trapped irretrievably

on the seabed.

[Patrick] The thing you worry about is entanglement.

You have to be vigilant as a pilot, you have

to be to paying attention of your surroundings.

- All right, McGee... - [Kelvin] Get it done buddy,

- get it done, get it done. - Thank you. All right.

[Patrick] Bring us home safe buddy, thank you!

- Thank you, Frank. - [Jonathan] Okay.

I'm getting ready.

See you later.

[Demetri] Accompanying Patrick

is deep ocean submarine specialist,

Jonathan Struwe.

[Victor] It's really dark and deep

and difficult down there to navigate.

I just hope they find it.

What an accomplishment that would be.

- Let's have a good dive. - Let's have a good dive.

[Victor] They're a long way from home down there.

And you feel it, I tell ya.

Let's launch the sonar.

I am going to go ahead, I'm going to increase

the scanning speed.

[Demetri] Once on the bottom, they start the search

for the lost lander, codenamed "Skaff".

Oh, yeah. That's something.

So, we are two meters off the bottom.

We'll get you Skaff, careful.

[Demetri] They use the sub's sonar

to ping the surrounding landscape

in the hope of a return echo.

Here you go,

now it should be in your window.

Just a second and it'll be in your window.

There. You can see him.

[Patrick] Oh yeah, here we go.

[Jonathan] Skaff.

There we are.

[Patrick] Okay. We are on it.

[Jonathan] Yeah. No. It's...

-It's ahead of us -[Patrick] Yeah,

- dead ahead of us. - [Jonathan] It is dead ahead

of us.

Yeah, get right over there,

get the lights on it.

[Jonathan] There we are.

[Demetri] Having landed at an awkward angle,

one corner of its base is wedged in the sediment.

Jonathan must now work the robotic arm

to release it.

This is the most dangerous part of the operation.

Ah [bleep], what's going here?

Index again and try to straighten out.

Try, try, try doing that.

[Jonathan] I can't, for some reason.

Ah.

[Patrick] Okay allow me just to come ahead

I'm going to push you.

Yeah. I am going to push the lander.

[Demetri] If the arm gets entangled with the lander,

and the emergency arm-release fails,

they could be trapped beyond any hope of rescue.

Back up just a little bit.

Let's get into the right position.

[dramatic music playing]

What was that?

[Demetri] Patrick and Jonathan are attempting

a daring rescue mission seven miles under water.

[Patrick] Get into the right position.

[Demetri] One wrong move and the sub

could get snagged on the trapped lander.

[Jonathan] He's going up!

We hit him.

He's on his way!

Aaah! [laughs]

Patrick! [laughs]

Woooh!

[Patrick] Surface, LF,

the lander has released

[cheering]

[Victor] This is the deepest

maritime salvage operation ever attempted.

And to say that we actually had

a marine lander trapped on the bottom

and then sent two men submersible to the bottom,

found it and released,

it is simply a technological tour deforce.

It's extraordinary. I am so proud of the entire team.

[chuckles]

[Demetri] With all three landers on board,

the crew is now getting ready

for the deepest dive on the planet.

And the scanning team has made

a ground-breaking new discovery.

Their high-resolution data

reveals a location on this planet

that's deeper than any found before.

[Cassie] We estimate to be 10,920.

Plus or minus 15 to 20 meters.

[Demetri] At nearly 36,000 feet deep,

it's a staggering 117 times

the height of the Statue of Liberty.

If Victor is successful in his mission,

he will become the deepest-diving man

in history.

[Victor] We're going to be assaulting

the challenger deep with more technology

and more capability than anyone

has ever done in history.

We have the most advanced sonar in the world

and we have a submarine with a two-person

titanium sphere that can do multiple dives.

No one had this before.

One, two, three.

[Demetri] This will be the sub's ultimate test.

[Victor] The challenger deep here in the Mariana trench

is the mount Everest of deep ocean diving.

The pressure is 16,000 psi.

The viewports they compress

almost a quarter of an inch

under that intense pressure.

[Patrick] Ready for Victor.

500 meters from the site.

[Victor] It's three and a half to four hours

- down and up. - Have a great dive Victor.

[Victor] So it stresses every part of the submersible.

Good luck to us all.

What's really worrying is that

something might not work.

[Demetri] If something serious goes wrong,

Victor is on his own, where no other craft

can possibly reach him.

[Tim] Sub's clear!

All comes down to this

after 4 years of planning, building, testing, diving,

this is the big one.

[dramatic music playing]

[Kelvin] Fantastic, have a good one Victor.

[Victor] Thank you. See you all on the other side.

Let's get the oxygen going here...

[Demetri] To keep Victor alive deep under the water,

the sub is equipped with enough oxygen

to last for 4 days,

but the carbon dioxide Victor exhales

could be lethal.

So two high-tech devices called "scrubbers",

packed with absorbent materials,

work relentlessly to keep the carbon dioxide

below dangerous limits.

[Victor] Surface, LF present depth, 833.

Heading 045.

- Life support good. - [Patrick] Roger LF,

understand life support good,

we have you loud and clear, Victor.

[Victor] You can hear the outside of the sub creaking

just a little bit as it just kind of settles in.

[Demetri] Every 60 seconds, the pressure

on the sub increases by 400 tons.

The equivalent of one jumbo jet

added on top of it every minute.

Victor is aiming for a lander,

located in the deepest part of the trench.

He will then ping the other two

to determine his exact position on the seabed.

My three companion robots are probably

on the bottom now.

[beeping sound]

[Tom] All right. Patrick, we've got an issue.

Lander on the way up.

[Demetri] The release mechanism

on one of the landers has triggered early

and it is now hurtling up under the sub.

Captain be advised, we appear to have a situation.

The lander has left the bottom unexpectedly.

At this time just about 400 meters

below Victor and on its way up.

That's weird, the lander is closer to 'em.

Wrong reading?

Something wrong with its modem?

LF, LF.

LF.

Roger, go ahead.

Be advised,

lander has left bottom.

Has left bottom.

[Victor] Oh [bleep] there is a collision risk.

I mean, I'm going down right on top of it.

Hope it doesn't hit me.

[Demetri] If there's a collision,

it could rupture mission-critical components

of the sub.

[Patrick] They are not even 200 meters apart now.

Hundred and fifty meters apart.

They are hundred meters apart.

- Within 50 meters. - [Victor] [bleep]

[Demetri] On his way down to the deepest place on earth,

Victor is in danger of crashing

into one of his own robotic landers,

now heading up beneath the sub.

[static radio]

[Demetri] If Victor collides with the lander,

it could be the end of the mission.

I've always worried about mid-air collisions

as a pilot, but I never thought I could have

that deep in the Mariana Trench.

[Patrick] Within 50 meters.

I am certainly not gonna be jamming thrusters down.

I don't want to run into him.

[Patrick] They're probably very close to one another.

[dramatic music playing]

[Victor indistinct on radio]

[Patrick] It's above him.

[Victor] Yep, looks like it has passed me.

Strange things happen down at this depth.

Woah, seeing 10,000 meters is pretty interesting.

That's a big number.

Can't help but to be a little bit nervous.

[Demetri] The sub is now under

the greatest pressure in our oceans.

Equivalent to having the largest aircraft carrier

in the world sat on top of it.

[Victor] Altimeter is at 237.

Looking out the portal just make sure

that I don't slam in the bottom here.

[dramatic music playing]

Thirty-four meters to go.

Should start coming into view...

Come on. So close.

Eighteen meters.

[dramatic music playing]

I can see the bottom on my display,

there's the brown of the bottom.

Touchdown.

[dramatic music playing]

There is the bottom of the entire ocean.

Surface LF,

at bottom.

[cheers and applause]

Congratulations Victor, congratulations.

[Victor] Congratulations to you all.

[Demetri] Victor is now 35,843 feet

below the surface, deeper than anyone else

before him.

Beginning exploration of the bottom.

Outstanding. What a moment...

Wow, it's so soft.

In some respects this is such an alien environment.

Eleven thousand meters down,

16000 PSI, no light.

This is almost like an alien world.

Oh, wow, wow, what's that guy?

Whoa, whoa, we've got to go back and check that out.

That looked like something really interesting.

Who are you little guy?

What in the hell are you?

You're like a... a jellyfish snake.

[Demetri] This sea cucumber uses its transparent tube

feet to forage for food in these crushing depths.

Definitely some life down here.

I saw it with my own eyes.

[Demetri] During their operations

below 13,000 feet in the Mariana Trench,

the science team has gathered footage

of even stranger animals.

- Look at that. - [Johanna] That is cool.

[Alan] This fish is a cusk eel.

What makes this one really interesting

is that it has a transparent head

made of a gel like substance.

It's almost certainly a new species.

- Well, that's not a fish. - [Joanna] I know.

What the hell is that?

This animal that is drifting past the camera

is a colony or collection

of lots of little small animals.

It's kind of like a jellyfish

but there is lots of, if you imagine thousands

of little jellyfish holding it together,

and we call that a siphonophore.

[Johanna] Oh, that's a really good shot.

[Alan] I would say that's the best video

of a snailfish we've ever got.

The Mariana snailfish is quite an iconic fish.

These fish are right on the absolute limit

of what all fish in the world can cope with.

If they were to go any deeper

than where we have seen them

their cells would start to implode.

[Demetri] It is a rare glimpse

of the elusive creatures of the deep,

but soon Victor makes a more disturbing discovery.

[Victor] What the hell is that?

I saw something that looked like

a triangle and nature doesn't do straight edges,

they don't do straight lines,

and I saw something that looked like

a piece of refuse.

[Demetri] Close examination reveals what appears

to be a letter "S",

evidence of the unstoppable impact

of human pollution.

[Victor] It's unfortunate that even there

at the very bottom of the ocean,

that there is, you know, contamination of some kind.

[Demetri] Victor has broken a record,

but extreme conditions are taking their toll.

I've been here for 4 hours.

We're running out of power.

Challenger Deep.

Let's go home.

Surface weight release.

Here we go.

Like a moon launch.

[beeping sound]

What was that? That's a new one.

Well that ain't good.

It looks like we've got a big battery fault, yeah.

I wonder if I hit something on the bottom

that might have caused an issue.

Oh, that's great.

Now everything is black in here.

[dramatic music playing]

My heart rate is up a little bit.

Surface, LF has lost power,

is on emergency battery power only.

Do not have good communication.

[Patrick] Roger, understand, we will track you

from the surface.

[Demetri] Still three hours from the surface

and with no main battery supply,

the sub's systems start shutting down.

First goes the heating

and the temperature quickly drops

to near freezing.

Got my warm gloves.

[Demetri] But things are about to get

far more serious...

[beeping sound]

CO2 alarm 0.5.

[Demetri] Normal carbon dioxide levels

in the air are 0.04%.

In the sub they are now rising rapidly.

[tense music playing]

[static radio]

CO2 is 0.72? Is it?

[Demetri] Every breath Victor takes

releases more toxic carbon dioxide

into a sealed environment.

If the levels keep rising,

Victor may not have long

before he loses consciousness.

[dramatic music playing]

[Steve] Still 40 minutes from the surface,

carbon dioxide levels inside the sub

are reaching alarming levels.

[beeping sound]

The CO2 is rising rapidly.

At 1% CO2 you start to feel ill effects,

at 2% I believe you pass out.

[Demetri] If the levels keep rising,

Victor might not reach the surface in time.

0.5 is the alarm condition.

LF, what is your O2 reading?

Confirm, both scrubbers are running?

You do have a secondary analox unit

you can power that up.

[tense music playing]

[Patrick] LF, what is your reading?

Control be advised CO2 level 0.32.

Roger. Say again, say again your last Victor.

[static radio]

Control be advised, CO2 level

back down to 0.32.

Roger that, okay man,

will see you on the surface.

[Demetri] 12 hours since his early morning launch,

Victor returns from the deepest place on earth.

[Rob] LF, this is Xeno, welcome back, Victor.

[Tim] Swimmer in the water!

[Rob] LF, LF Xeno This is Xeno.

Yeah, Victor, we are taking the odd wave

across the top of the sub, if you could thrust up.

[Victor] Surface, be advised,

using thrusters overloaded

my remaining batteries, batteries are dead.

[Demetri] With no power left,

the sub can't fully resurface.

Swimmer Tim once more has to put his body

- on the line. - [Tim] I got it, back away

[man speaking indistinctly]

[man] Okay. Standby with the handrail.

[Patrick] Keep an eye on that towline, boys.

[Tim] Towline has come loose!

Towline has come loose!

[Rob] Give him slack! Give him slack!

Give him slack!

You okay Tim?

[tense music playing]

Tim? You look good?

You okay, Tim?

[tense music playing]

[Patrick] LF is on the hook.

That was [bleep] sporty boys.

[dramatic music playing]

[cheers and applause]

[Victor] Thank you, guys, well done!

Thanks for coming to get me!

[Demetri] Despite an electrical failure

and a carbon dioxide scare,

Victor has conquered the fourth

of the five oceans.

[Victor] Well done.

[Patrick] You did it buddy, you did it!

- [Don] Congratulations. - [Victor] Captain Walsh,

well done sir. Thank you for showing the way.

- [Don] You're my hero. - Thank you.

No, you're mine.

[Patrick] Victor Vescovo,

world's deepest diver!

Whoo!

[Victor] It was a... It was an amazing dive.

I think almost exactly 12 hours

but I must confess that there is more life

down there than I expected.

I thought it was gonna be completely dead,

and it is not.

[dramatic music playing]

I'm just glad to have you...

- It's good to be back. - ...back home safe.

It's great to have him back.

It was a great dive.

[Don] It's an inspired clever design.

And even it's been 60 years since we did ours,

this is like stepping into the future.

[Victor] Looking at a map you can take a look

at the Mariana Trench and its very dark and blue,

even black. Its intimidating.

I have seen the sandy bottoms,

I've seen the rocky ledges,

and it's not a deep dark scary place,

it's tough to get to

but there's an incredible amount of things

to discover there and we now have a tool

that can bring us there.

[dramatic music playing]