All language subtitles for 4_English44

*

*

[whale squeaking]

ARI: I'll try and get a biopsy
sample from one of these guys.

I decided at a very early age

that the ocean and studying
how animals behave

in these extreme environments

was something that was
of interest to me.

Oh, [bleep], look at that.

If you want to find the biggest
animals on the planet...

[bleep]

LESLEY: Wow.

ARI: ...in the most challenging,
extreme place in the world,

you're talking about whales
in the Antarctic.

This is just insane.

When you're that close up
to an animal

that's 40 tons and 45 feet long,

we could put ourselves
in a dangerous situation.

You have to sort of manage
those emotions,

because it's so cold,
if you end up in the water,

it's game over.

*

*

ANDREW: It's morning.

[sighs]

ANDREW: Out here, coffee doesn't
stay hot that long,

probably about five minutes.

At least we have insulated cups,

so it takes a little bit longer,

but still you want to be
drinking your coffee

pretty quickly, I think.

NARRATOR: The Ross Ice Shelf
team is hundreds of miles away

from any other human life,

on a floating chunk of ice
roughly the size of Texas.

TOM: Does anybody here
need water?

Keep hydrated.

There you go.

NARRATOR: Over the last
four days,

they've battled through
the deadly shear zone...

TOM: We've well and truly
opened this up.

NARRATOR:
...and a Condition 1 storm.

CHRISTIAN: Because of the
blowing snow and low visibility,

we're gonna just stay put
until it improves.

NARRATOR: All to learn about
the ice shelf's past,

to help predict its future
in a changing climate.

LAURINE: So I suppose this is
where the real stuff begins.

It's kind of exciting as well,

that now we're actually
on the way, doing our science,

and we've started to do
what we came here for.

CHRISTIAN: Been talking about it
for so long.

Traverse this, traverse that.
How much fuel do we need?

It's kind of crazy,
we're doing it now,

which is really nice,
but I'm still impatient.

I still want to start
using the Thumper,

and start answering
the science questions.

I'm pretty certain
that we're going to lose

the actual ice shelf itself,

and parts of
the West Antarctic ice sheet

at some point in the future.

It'll turn into water,

but it's where that water goes

and how much of it turns
actually into sea level,

that's the big question, right?

Six, seven meters requires
a whole reorganization

of how we live
and our civilization,

because you write off

some of the most populated parts
of the world, you know?

Downtown London, well,
I guess that's gone.

NARRATOR: In order to study the
ice shelf's geological history,

they need to find sediment
on the sea floor beneath it,

so they can sample it, as part
of the project in future years.

CHRISTIAN: I mean, we can throw
the streamer out now.

LAURINE: Okay.

CHRISTIAN: And then thump
our way along.

We just want to make sure
that this is the right place.

You know, we've just dragged
all this equipment out here.

The immediate goal of just
see the sea floor.

Make sure it's there and
that it's flat and smooth,

and that there aren't
big rocks in the way.

What number are we up to?

LAURINE: 17.

CHRISTIAN: For the science
world, this is a big deal.

You know, we're talking about
megabucks for us.

A lot of time, a lot of effort,
from a lot of people.

There's a lot riding on it.

NARRATOR: To determine if
they're in the right spot,

the team will launch

a hydraulically-driven,
500-pound weight,

called the Thumper, at the ice,

and use the reflected sound,

heard by 96
geological microphones,

to create a picture
of what they can't see.

CHRISTIAN: Basically, we're
slicing through the ice shelf,

through the ocean,
and into the sea floor.

We turn that slice on its side,

and then we can see
the different layers

inside the ocean.

ANDREW: Make sure you tap
the snow out of these things.

CHRISTIAN: So we don't have
a short circuit, right?

ANDREW: Exactly.

CHRISTIAN: So, our goal is
to actually get that picture

of what's underneath
the ice shelf.

We hope that our research will
impact those people that decide,

right, climate change
is a problem now.

This carbon dioxide
is gonna kill the ice.

Uh, it's gonna melt it.
We're gonna be in trouble.

We've been building equipment
for six months,

and we're just really excited
to actually get into it.

LAURINE: Ready?

CHRISTIAN: Yep!

[laughs]

LAURINE: There it was.
[laughing]

CHRISTIAN: You can feel that!

ANDREW: It didn't trigger.

LAURINE: Uh-oh.

Is it triggering on the way up?

ANDREW: It triggered up.

CHRISTIAN: Well, [bleep],
that's not good.

LAURINE: As soon as the weight
drops, it hits the switch,

and it triggers the system

that basically triggers the
microphones to start listening.

For some reason, it's not doing
it when the weight goes down,

but when the weight goes up.

So, we're just trying to sort of
figure out why it's doing that.

ANDREW: Didn't trigger again.

NARRATOR: If the Thumper
and geophones

are even milliseconds
out of sync,

the results are worthless.

LAURINE: I think I can see
the problem.

Their sled, it's got too many
links at the back,

so now it's not
centered properly.

So I think we need to pull it
backwards slightly.

All of our systems have come
from different areas

around the globe.

So our geophone, streamer,
came from Germany,

our computer system
and the geodes,

they came from the States.

So, it is a little bit
nerve-racking

to see whether all of those
components do interact,

and whether they work
in an Antarctic environment.

[thump]

ANDREW: Okay, it triggered.
So that's good.

LAURINE: So we're ready
to move up?

ANDREW: Yeah, move up.

LAURINE: If our team
is unsuccessful

for finding a proper location,

then it is basically the end
of that aspect of the program.

So, I think we are
a little bit worried.

[thump]

*

WALKER: Go ahead and come up,
like, you know, position eight.

NARRATOR: Hundreds of miles
from the ice shelf,

off the coast of McMurdo Sound,

is the US Coast Guard
heavy icebreaker Polar Star.

She's come all the way
from Tasmania,

then past the Antarctic Circle

to open a vital shipping lane to

resupply bases on the continent,

and after four days,
they're only halfway done.

WALKER: Can you give me
a distance to Hut Point?

DURLEY: Approximately nine
nautical miles off Hut Point.

WALKER: We have to cut a channel
that's 18 miles long.

We have to do it in a way
that it's safe to navigate

for the supply ships
that come in.

It takes us a good week
of constant ice breaking.

WALKER: What's our speed?

MAN: 3.2.

WALKER: And if you can imagine

trying to drive your car

through a cement wall,

it's very, very challenging.

You can see,
as we're breaking through it,

some pieces are harder
than others.

You can see the way
it fractures off.

Pretty soon, we might have to
back out of here,

and take another whack at it.

I mean, it's getting
thick quick.

We go through a section where
the ice is 10 to 12 feet thick,

but it's also very, very hard.

So it looks like this is
the multi-year ice,

so, we'll have to start
backing and ramming.

NARRATOR: First-year ice
averages one to six feet thick,

and thaws fully in summer.

But multi-year ice
builds up over time,

and as air freezes in with
the water, it also gets harder.

WALKER: Let's back up.

At some point,
breaking the channel,

ice will get too thick for us
to have continuous ice breaking,

so we have to
what's called 'back and ram.'

I have my rudder midship,
and backing all three.

WOMAN: Aye.

WALKER: We'll back up,

and we'll get up to about
6 to 8 knots forward,

which is 14,000 tons of ship
going 6 to 8 knots,

making that ram into the ice.

Pretty significant amount
of weight and momentum.

Looks like we're pretty clear
back there now,

so I will bring it to all stop

and then start backing down
on her.

MAN: Roger, starboard shaft,
up to speed. Seven knots.

WALKER: It's a very, very
violent evolution,

to back and ram.

Imagine a 10, 12 Richter scale
earthquake.

MARY ELLEN: 10 knots.

WALKER: The ship's about to hit
some ice right now.

MARY ELLEN: Brace for shock.

[rattling]

WALKER: It shakes
the whole ship.

You can feel it up through
your feet, up through the decks.

You're just trying to keep hold,
and it gets violent quickly.

Are we up to speed?

MAN: Yes, sir.

WALKER: How fast are we going?

MARY ELLEN: Nine knots.

[rattling]

WALKER: She's falling off.

Let's back up and see
if we can try again.

MAN: Yes, sir.

NARRATOR: The trickiest part
of this process

is actually reversing,

because it means exposing
the propellers and rudder

to huge chunks of ice they've
just smashed off into the water.

WALKER: Put the stern over,
keep the ice out of your rudder.

*

Ease it, ease it.

Oh, oh, oh.

Hey, what just happened?

Something, I just hit something.

Oh, crap.

MAN: Starboard side.

WALKER: What, what was that?

All stop.

MARY ELLEN: Just trying to find
amidship, sir.

WALKER: Main control, con,
what's the indicator saying?

Where's the rudder position?

WALKER: Four right?
We're showing...

MAN: Left four.

WALKER: Four left.

WALKER: If it got
into the rudder,

it could disable the ship
to be able to steer.

If Polar Star does not
complete her mission

in breaking out the channel,

then the supply ships
can't get in there.

We can't get fuel and food
into Antarctica.

There's approximately 5,000
people in the continent

that depend on that
food and fuel.

That is the overriding pressure
on my shoulders,

is fulfilling that mission.

[bleep]

NARRATOR: 2,300 miles away

off the Antarctic Peninsula,

is the research vessel Ortelius.

MAN ON RADIO: Can you tell us
which gangway, please?

MAN ON RADIO: Port side is
ready now, port side is ready.

NARRATOR: Dr. Ari Friedlaender's
floating field lab

is a tiny inflatable raft...

in the vast Southern Ocean,

and today he's after
humpback whales.

ARI: It's quite, quite windy
this morning,

about 20 knots of wind.

These are pretty marginal
conditions,

but we're, we're doing
the science that we can get done

in these conditions,
and that's the biopsy work.

It's too windy for the UAVs.

It's a little too choppy
for us to try tagging,

so, we'll try to make
the best of it right now

and take what
the weather gives us.

We use a crossbow with
a modified bolt that floats,

and we shoot it at the whale,

it takes a little piece
of blubber that we collect,

that's about the size of, like,
an eraser on top of a pencil.

And that little sample is
absolutely critical for us,

because we can tell whether the
animal is a male or a female,

if it was a female,
if she was pregnant.

We can look at the genetics

to tell what population
that whale came from.

We can look at what the animals
are eating as well.

Alright, whales are up
at about our one o'clock.

We're kind of cruising
into the wind,

so I'm gonna try and
parallel their track

and see if we can't try
and get a biopsy sample

from one of these guys.

That would be fantastic.

NARRATOR:
While a biopsy on its own

provides a wealth
of information,

the real prize would be a biopsy

from a whale
he's already tagged.

He's had some success
this season.

ARI: Sweet.

NARRATOR: And he's back
in the same feeding ground

to see if he can find
the same whales again.

ARI: Once the tag
goes on the whale,

then we're just kind of
starting the adventure.

It's really important for us to
try and collect a biopsy sample

from every animal that we tag,

because having that
biopsy sample

gives you a much better
understanding

of the behavior
that you're seeing.

I'm not sure if that's one we've
sampled or not, to be honest.

Can't tell.

No, it's not.

[bleep]

It takes patience to be
a field biologist for sure.

Working the Antarctic probably
takes an added level,

because of just getting
the right conditions.

I never thought of myself as
a patient person, to be honest,

but I guess you kind of
have to be.

You're really at the, at the
whim of the animals down here,

so, you take what you get.

I'm gonna kind of
keep this heading,

and maybe we can get him
on the other side of us.

The more we can do for each
individual whale, the better.

It's an animal that we'd love
to be able to see over time

and learn about the life history
of that individual.

We can identify
individual whales

by some very characteristic
markings.

Humpback whales are great,

because the underside
of their flukes

are a unique pattern
of black and white.

Got a humpback whale right here,

just kind of slowly cruising
at the surface.

Think that's the one we want,
there,

with the smaller dorsal fin.

Awesome.

NARRATOR: The biopsy crossbow
can shoot up to 165 feet,

but the closer Ari gets,

the greater the chance
he might startle

one of these
66,000-pound animals.

ARI: When we're approaching
a whale,

human safety is
the first concern.

When it's breeding season,

the big males, they'll come
out of the water at you.

We don't want to do anything

that's going to make them
react too quickly.

The Zodiac might get flipped.

And because it's so cold,

if you end up in the water,
it's game over.

NARRATOR:
The worst-case scenario

isn't just hypothetical.

In 2015,
on California's central coast,

a massive humpback whale
launched out of the seas...

[woman screams]

...nearly crushing two kayakers.

And in waters this cold,

hypothermia is more likely
to kill than impact is.

ARI: See him underwater here?

Just let him take a look at us.

The things that go through
your head before you do this

is you just want to make
absolutely sure,

I'm in the right position,
I've got the right angle.

I've got the right animal.

And then, don't miss.

*

This guy is diving.

Looks like we just missed
that surfacing.

You see the footprint
pretty well

where they went down,

and so now I'm going to give us
a little bit of gas.

I don't see it now.

I see it.

*

*

ARI: I see him.

NARRATOR: Ari's got a chance
to get a tissue sample

from a humpback whale...

ARI: Just let him
take a look at us.

NARRATOR: ...if he can hit a
moving target from 50 feet away.

*

ARI: Got it. Got it.

It's hard to see the darts
in the water here.

I saw where it landed,
but I just got to go slowly.

*

Oh, man.

ARI: So, on that shot,
what happened was,

instead of hitting it
flush on the side,

I kind of hit it and
skimmed off of it.

So, what you see is just some
of the skin sticking out.

It didn't get
a big blubber sample.

Mostly just skin.

It's important to try and get
both skin and blubber,

because the different tissues
allow you to tell

different things
about the animal.

NARRATOR: Adult humpbacks
can hold their breath

for almost 45 minutes, and
swim 7 miles per hour or more.

If Ari loses track of this one,

it could be 5 miles
in any direction

the next time it surfaces.

ARI: That was the whale
we wanted to get a sample from.

At least you get an idea about
the direction they're going,

and we can, we can kind of match

their speed and their course,

but eventually they're
just gonna disappear.

NARRATOR: Back on the mainland,

at Scott Base, New Zealand's
permanent science station...

REGINA: We have an absolute ton
of work to do.

BEN: If we have a catalogue
of the ones

that have been biopsied already,

we should try to especially
keep an eye open for those.

NARRATOR:
The marine megafauna team

is also gearing up
to study whales,

but instead of humpbacks,
they're after killer whales.

ROGHAN: We need to be
the right side of the channel

so the light's behind us.

We need the right conditions
on the water.

REGINA: Well, we get less than
three hours of helicopter time.

And this is Antarctica,
everything takes

between three to ten times
as long as you think it will.

NARRATOR: Unlike Ari,
they don't use boats.

They actually fly
to the ice edge,

find a safe enough
place to land,

and stand inches
from open water,

to biopsy whales with darts
fired from a modified .22 rifle,

and whatever data they get

could actually help regulate
international law.

BEN: Got eight barrels,
spare tips.

NARRATOR: This is called
Chilean sea bass

in New York restaurants,

but its real name is toothfish.

And scientists suspect
that Antarctic toothfish

is a staple food for some
killer whale populations,

and if we're competing with them
for the same food,

the 25-member nation body
that oversees the fishery

has to know about it.

*

BEN: We're trying to understand
the ecological role

of the killer whale population
in Antarctica.

We don't know
how many there are,

and that's actually
quite critical

if you want to know how many
toothfish they're eating.

So we want to make sure
that we don't...

make sure we don't
make a mistake,

make sure we don't do
something we shouldn't.

*

NARRATOR: Whales are typically
found along the channel

opened by the Polar Star,
or on the edge of the sea ice.

Today, team leader Regina Eisert
is picking the sea ice

to find animals,

and a stable enough place
to land when they do.

REGINA: You want it to be
nice and dry,

and you want the edge
to be really sharp,

and you want the ice
to be thick.

Don't want any melt pools,

and you don't want any cracks

that run parallel to the,
to the edge.

Worst-case scenario is you put
the helicopter through the ice.

That would be bad.

It's usually up to me.

It's my decision
as expedition leader.

NARRATOR: 'Tiling' is when
seemingly stable pieces of ice

break off in large chunks,

making landing in the area
a huge risk.

BEN: The ice edge concentrates
the animals,

because they eat seals
and penguins.

The whales don't want to be
100 meters away.

They want to be on that edge.

That's where all the action is.

All the action is on the edge.

You respond to what you see
in the moment.

REGINA: It's no good to us
if the ice is really stable

but the edge is rotten, because
I need to get right to the edge.

It might all be super stable,

but the entire front of the ice
is mobile.

We can't go there.

*

ANDREW: Hey, so you want to look
at some of this data?

NARRATOR: The Ross Ice Shelf
team has spent four hours

covering 1.2 miles, running
the Thumper dozens of times,

trying to find the sea floor
under the ice.

Now, they have their first
set of data.

CHRISTIAN: This is the first
science that we're gonna do,

where we get the results
straightaway.

So, that's the big curiosity--

are we in the right spot
for the X?

It's exciting, I mean, everyone,
everyone who's a scientist

loves to see results and data.

But you know, if it's not
the result that we want,

then we'll actually
have to think about

what we're gonna do next.

ANDREW: So, what we're
looking at here

is sort of the really
complicated sound signal

that each geophone receives.

After we send off the shot
for sound to travel down,

through the ice,
down through the ocean,

hit the sea floor
and come back up,

should take somewhere
around 0.4, 0.5 seconds,

about half a second.

If it's a really sharp
reflection of the sea floor,

it should really be
a very strong sound,

rivaling some of the sound
traveling through the ice.

And there's no really, really
obvious sounds in here.

So, there's nothing
really there.

CHRISTIAN: This is horrible.

It took four hours' worth
of processing the data,

cleaning it up.

Can we see the sea floor?
Can we see the sea floor?

No, we can't, it's not there.

It's kind of heartbreaking

when things don't work
or when you fail.

But you know, you just got
to keep going.

The next step is just go
20 kilometers downstream,

or 10 kilometers downstream

and have another look
somewhere else.

We don't want to have to move
the camp, so we'll keep looking.

It's got to be here somewhere.

*

The first thump we're actually
compressing the snow

to take the air out of it
and make a good surface,

and the second thump,
this one here,

is the one we actually
record now,

and it's always a better thump,

because we're sending,
using all the energy

to get sound into the ice shelf,

and then it gets recorded
by the geophones

that are on that line there.

*

[thump]

Aww!

Oh, no.

The wee sled is suffering now.

I think we've broken its back.

Everything just gets ruined
by the cold.

*

Everything just becomes
more brittle.

So, your average nut,

which has got a little
plastic ring inside it.

So, when you screw that on
it should lock onto the bolt,

and it shouldn't come off.

In Antarctica,
they just unscrew themselves.

*

Ooh, no, oh, no.

The beginning of the end.

ANDREW: Uh-oh.

CHRISTIAN: We're getting tired,
the sled's getting tired.

We're just hoping
that it makes it.

Come on, little sled,
you can do it.

NARRATOR: 240 miles away

in the mouth of McMurdo Sound...

WALKER: Main control, aloft con.

Could you check out
the steering gear?

We're seeing some fluctuation
in the readings up here.

NARRATOR: The Polar Star
is dead in the ice.

WALKER: Our rudder indicator
isn't agreeing with the helm.

NARRATOR: And Captain Walker
can't restart the engines

until he's sure
there's no damage

to the rudder or propellers.

NARRATOR: But they're over
20 feet beneath the surface,

and there's only one way
to check for damage.

WALKER: Put two people out
in dry suits to inspect it.

WALKER: If there's damage
to the gear under the water,

I really have no way to tell
what that damage is.

I don't have a camera
mounted on the hull

that I can look at
the propellers and the rudder.

TRISTAN: Alright, on the side,
headin' divers.

DIVERS: Headin' divers.

WALKER: So, I will send
my dive team over the side,

and they will do an underwater
inspection of the ship

to make sure
everything is sound.

TRISTAN: Alright, hey, remember,

if those things
go over your hood,

you might get water or
air intrusion up under there.

Be aware.

Good?

WALKER: We'll go ahead
and put the brow over.

*

TRISTAN: Our most important
mission, while we're down here,

is to make sure
the ship continues running.

The running gear,
the props, the rudders,

make sure that everything
is good down there.

Alright, I got to
watch them now.

CAMERAMAN: Yeah, of course.

NARRATOR: To make sure
the propellers

have stopped spinning,

the divers have to
give them wide berth.

MAN: Green divers.

NARRATOR: A path that takes them
under the unbroken ice.

WALKER: Sending divers in
the coldest water in the world

is a decision
I don't take lightly.

It's a very dangerous operation

for the divers
to dive under ice.

If something should happen, they
could be stuck under that ice.

I'd never be able
to get them out.

TRISTAN: Hey, tell green diver
his line is snagged

on the ice someplace.

TRISTAN: Have red
check his lines.

MAN: Red diver,
take a look at green.

TRISTAN: Both divers,
this is Dive Supe.

Can you see each other
right now?

TRISTAN: Hey, red,
turn to your left!

TRISTAN: Green, take a look up
so you know which way to go.

[bleep]

*

MAN: Red diver,
take a look at green...

NARRATOR: 20 feet underwater...

[bleep]

...Coast Guard divers
are trying to check the props

and rudder for damage.

TRISTAN: Hey, red,
turn to your left.

NARRATOR: But one of them
is caught on the ice.

MAN: Red diver is trying
to assist him right now.

TRISTAN: Is he good?

MAN: Okay, both divers.

TRISTAN: There they go.

Now the fun begins.

WALKER: I only have one rudder.

If I lose it,
I can't steer the boat.

WALKER: This isn't
the normal world.

This is Antarctica.

And we have to do
dangerous things.

The overriding pressure
on my shoulders

is fulfilling that mission
to resupply Antarctica.

*

How we looking?

WALKER: Alright,
just keep it here

and put the engines
on 30-minute standby.

MAN ON RADIO: 30-minute standby.

TRISTAN: Got a big orca
back here.

*

*

PILOT: This western sheet looks
better attached, in general.

BOTTS: Yeah, I can't see
any cracking

or pressure lines there,
or melt pools, so.

BEN: The ice looks good.
I haven't seen any whales.

NARRATOR: The marine megafauna
team left killer whales behind

at the edge of the sea ice,

because it wasn't stable enough
to touch down on.

NARRATOR: Now they're
in the channel,

where the ice
should be sturdier.

BEN: We got nothing.

You can see a long ways
from a helicopter.

We didn't see anything.

We should just go back.

Now, I don't know if we'll get
the clearance to do it, but.

REGINA: Let's have a look
at this site.

Maybe put the hydrophone in?

BEN: [sighs] Okay.

REGINA: To do this
kind of research,

you only go out when
it's safe to go out.

It's my decision
as expedition leader,

and when there's real
clear and present danger,

you can't work,

and it's very frustrating,
but science is like that.

Can you find us a spot

where you can put
the hydrophones in the water,

so I can actually listen

to see whether there's
any whales around?

BEN: Yup.

REGINA: We can put hydrophones
in, which we use anyway,

to record their vocalizations,

which are very, very
interesting,

because they've got
quasi languages,

so we can actually identify
that group from their dialect.

And you can hear them
from quite a long way away.

So, we can often hear them

a long time before
we can see them.

So, we get early warning.

So turn one on.

And then we just throw it
in the water.

[sonar pinging]

*

BEN: If it still doesn't work,
we should move.

We don't have to stay in
one place for hours and hours.

[whales squeaking]

REGINA: I hear whales.

Ben.

BEN: Yeah.

REGINA: Whales.

There's lots of squeaking
going on.

BEN: Alright.

[whales squeaking]

Hearing a whale on the
hydrophone was never, for me,

a reason we should stay
in one place,

because you can hear a whale
on the hydrophone

and never see one.

Yeah, but you can probably hear
them from five miles away.

REGINA: Thinking we should get
the rifles.

[bleep]

BEN: Alright.

The better strategy is
you go where they are.

In terms of just not
seeing any whales

and expecting them to show up,

it's a loser's game,
in my opinion.

*

REGINA: Where is he,
where is he?

*

ROGHAN: Here we go.

REGINA: No penguins, please.

BEN: You know, my perspective
is always the same.

You got to hunt them
where they are.

REGINA: I can hear whales
very clearly.

Excited, little, squeaky whales.

ROGHAN: But they're not here.

BEN: I think if we are able
to go back to the place

where we actually
saw the whales,

that's the preferred option.

Where there was
floating tiles offshore,

we had whales against the edge.

But where the tiles
are coming off,

what they're saying is if we,
if we land the helicopter

on a piece that's
coherent enough,

even if it does technically
constitute a tile,

if it's not going anywhere,

and the helicopter is in the
middle of it, we can land there.

ROGHAN: So it'd be better to be
in a place where the whales are,

rather than waiting for them
to come along.

REGINA: Okay.

If we have any reasonable hope
that they will show up

in our location,
we tend to stay put.

But if there's no whales,
then there's no point.

BEN: Let's roll.

*

*

ARI: Eyes out, let's look
and see if this thing comes up.

NARRATOR: After missing
his first shot at a biopsy,

Ari's tracking
the same humpback,

for a chance at redemption.

ARI: Oh, I see it.

Whales are up about 80 meters.

Kind of moving upswell.

There's our guy.

Smaller dorsal fin, barnacles.

*

*

[shoots]

Amazing.

Just go grab the dart now.

Alright. Excellent.

So, successful shot.

You can see the blubber
hanging out of there.

[whale bellows]

There's the whale, no worse for
wear, back up at the surface.

Alright. I think we hit
a homerun today.

[whale bellows]

Man.

That was the whale we sampled.

Man.

*

This is just insane.

It's going right underneath us.

When the whales choose to
come over and check us out,

we kind of sit back and let it
happen, for the most part.

It is definitely a little bit
of a role reversal in some ways.

To make eye contact with a whale
is pretty humbling.

You can tell that there's
something going on

behind there.

There's a living animal
that's thinking about something,

and it's a pretty strong
connection.

We've got two really friendly,
curious whales here,

really unique opportunity for us
to see the animals up close.

There is no place in the world

where you feel smaller
than Antarctica.

The fact that you're working
with animals

that are as big as, you know,
a school bus,

it makes you feel small
very quickly.

This is extreme wilderness.

This is nature without
any filter on it,

and for us to have
the opportunity to be there,

and to work in that environment,

to me, I couldn't ask
for anything more.

*

NARRATOR: 2,100 miles away

on a virtually unexplored
mass of ice...

*

NARRATOR: The Ross Ice Shelf
team is in a new location,

looking for a clear picture
of sediment

on the sea floor under the ice.

NARRATOR: The extreme conditions
can be lethal to machinery.

And they're running out of time.

CHRISTIAN: Come on, you bastard.

Oh! I think it's giving up.

In Antarctica, because it's
so cold, everything contracts.

Metal shrinks,
and it gets more brittle.

Nuts get smaller
and screws get smaller,

and so things just start
to unscrew themselves.

The environment just
ruins everything.

Electronics generally
tend to fail.

LAURINE: Oh!

So, our steel plate,
it's slowly started to,

like, all the nuts have
started to undo themselves.

CHRISTIAN: Ugh!

LAURINE: Now they've gotten
so loose

that basically the plate
has come up

and then rotated around that one
bolt that it was still stuck in.

So now we need to put it
back in place.

CHRISTIAN: Wow, so we completely
smashed its spine.

LAURINE: Yeah.

ANDREW: And you can see where
all these cracks are going here

from where the steel plate was,

'cause it's repeatedly
being hit there.

CHRISTIAN: So the thread
on these is completely buggered.

So this is basically
where the weight

has occasionally clipped it,

and it's just ruined
that thread,

which is why the nuts came off.

It's just had it.

ANDREW: Is there any other way
we can try to keep this on?

CHRISTIAN: I'm gonna use
a sledgehammer,

and I'm gonna bend these.

ANDREW: It's got to make it.

CHRISTIAN: I keep saying in
my head everything will be fine,

don't worry about it.

Because if the Thumper dies,
we're gonna be in trouble.

There's a lot riding on it.

We need to find the spot.

We need to succeed.

ANDREW: That might be enough.

CHRISTIAN: Alright. Back in.

LAURINE: I'm more worried
about the wood,

whether the wood is gonna
survive another round or...

*

I just wonder how long
it's going to last.

[thump]

TRISTAN: On the side, divers
coming to their next stop.

Next stop, surface.
This will be a NO-D dive.

NARRATOR: The Coast Guard dive
team didn't find any damage

to the ship's rudder or props.

TRISTAN: On the side,
divers moving back,

until the ten's straight
up and down.

NARRATOR: So, while the divers
are recovered...

MAN: He's checking the fuse
right now.

NARRATOR: It's up to engineering
to figure out

why the ship's systems
aren't working.

MAN ON RADIO: Main control,
what are you guys showing

your rudder's at right now?

MAN: Left 29.

WALKER: Left 29.

How does it show
in the steering gear?

MAN ON RADIO: I'm showing it
reading 10 left.

ENGINEER: Alright,
switching both to local.

Hit the start button.

There you go.

WALKER: Polar Star is
a very old ship.

We have 21st century,

state-of-the-art

control systems,

but the sensors to that

control system are probably

designed during

the Johnson Administration.

MAN ON RADIO: Con, main control.

WALKER: Sure, we'll cycle.

Cycle the rudder.

We're gonna go back
to left four,

see what it shows back there.

MAN ON RADIO: It's showing
four left right now.

WALKER: Roger, okay,
we'll go ahead

and steer off the analog
and ignore the digital.

MAN ON RADIO: Roger, let you
know if we have any more issues.

WALKER: Alright, let's do it.

It appears to be just
a fluctuation in indicators.

We have digital helm,
we also have an analog.

They're off a little bit.

The analog appears to be
more accurate than the digital.

Try to get close
to the ice edge.

MAN: Aye, aye.

[ice cracking]

*

BEN: I can see them offshore.

NARRATOR: The marine megafauna
team is back over the edge

of the sea ice, hoping to find
a safe landing zone.

NARRATOR: But with the whole
edge tiling off,

they have to land further from
the whales than they'd like.

BEN: When you finally are there,

you don't want to be
even 30 meters wrong.

30 meters is too far.

You've only got a narrow window
of time to actually deliver.

You have to strike
when the iron's hot.

We've got some
right on the edge here.

REGINA: There's one spyhopping,

it was half the whale came out
of the water right over there.

BEN: Nice. Oh, there we go.
Right there.

Let's go there. Let's go there.
Yeah? You happy?

REGINA: Oh, wow,
that was a big fin.

BEN: That's a big fin.

[cracking]

Whoa.

BOTTS: It's not safe here.

ROGHAN: Oh, [bleep].

I just saw the whole horizon
move on it.

REGINA: Ben, give this
a wide berth.

It's all cracked off.

Have a good look. Come here.

See that?

It's moving in the swell.

That means this whole piece
is detached

and will go out at some point.

Because of the work
and time and money

that's gone into everything,

it's very frustrating when
you got everything lined up,

and then I can't do my work.

You got to be kidding.

MAN: That's moving.

BEN: We're not gonna catch
those guys, are we?

At least we're going
the right direction.

REGINA: No, we're not gonna be
on that side.

BEN: Standing on the same edge
and seeing nothing

is, is frustrating,
but that's, that's science.

The real frustration
is not being able

to stand on that ice edge.

To be so close and then to be
prevented in the last step,

that's the part
that winds me up.

So I think tonight's another,
another zero.

It can feel like
a real pressure cooker.

You know, you've come so far

and you feel your trip
slipping away,

so every moment is critical,

'cause you might not get
another chance.

ROGHAN: Yeah, no biopsy samples.

Um, yeah, a bit frustrating.

But I hope we can make
the last couple of days count.

It just sucks.

BEN: Yes.

*

ANDREW: If we just start looking
at the processing flow,

the system's up
on the screen here.

LAURINE: Ugh.

NARRATOR: The Ross Ice Shelf
team squeezed just enough life

out of their Thumper

for one last chance to find
the sea floor under the ice.

ANDREW: Pretty shoddy
reflection.

LAURINE: Yeah.

NARRATOR: And now,
it's the moment of truth.

ANDREW: You can sort of see
a little reflection in here

at about two point, 210, maybe?

LAURINE: Yeah.

ANDREW: We've got each of
the shots stacked together,

so you can see, here's
the 35 shots or so along the top

where all these little things
come to a point.

CHRISTIAN: They look like
a dog's breakfast.

ANDREW: There's something there,
at the base of the ice.

But somewhere down here,
we're sort of expecting...

LAURINE: So maybe about six?

Scroll down.

ANDREW: Oh, my God,
look at that.

LAURINE: Whoa.

ANDREW: There you go.
CHRISTIAN: What's that?

ANDREW: We have sea floor.

CHRISTIAN: We have sea floor?

[laughing]

ANDREW: And it looks good.

Yeah, it's at about
780 milliseconds, I'd say.

[laughter]

Very relieved actually
after all last night.

After promising
it was gonna take an hour,

and it took closer to 12.

CHRISTIAN: A project like
Ross Ice Shelf

takes several years to do,

and we're going to
hopefully find out

how the Ross Ice Shelf
got to where it is today.

That's what I'm really
looking forward to,

and that's the next
bit of science

that's really going to,
you know, blow our minds.

Well, we've only spent
a year planning

and several hundred
thousand dollars,

and $40,000 building a Thumper,

and bloody another
$2,000 shipping,

and $200,000 streaming here,

and getting all these
electronics from the US.

I mean, you know.

LAURINE: Minor details.

CHRISTIAN: Every single
bloody step was a fight.

Every single step was not easy.

Success.

All the planning that's gone
into it, suddenly it's real,

and now, now the next thing
we're thinking is,

right, so what does the rest
of it look like?

We've got one spot,
how about the rest of it?

You know, we want
to just explore more now.

TOM: All the excitement!
Good news is what I like.

ANDREW: We've got the sea floor.

TOM: Yup.

ANDREW: We're in the right spot.

TOM: We're in the right spot!

TOM: Pretty happy to be
at our final destination.

[laughing]

TOM: We're here
in the right spot.

CHRISTINA: Oh, my gosh.
So exciting.

TOM: There's still
a lot more to come,

and it's really, it's just
the getting there part.

So, we are gonna have to
set up camp,

and then we need
to build a runway

to get some fixed-wing planes
to come in

and drop us out some equipment,
and some more of the team.

It's really just the first step
in quite a massive process

of the next couple
of weeks of work.

Great day, everybody.

And, yep, loads to do.

ROBERT: Okay. Right.
Let's do some work.