Original subtitles

[James Cameron] The Ocean...

the last frontier on earth.

So much is unexplored and unexplained.

To change that...

a kickass team of insanely talented specialists is

setting out to push the frontiers of what we know

about our oceans.

[Zoleka Filander] Oh my gosh.

[James Cameron] Zoleka Filander, deep sea scientist.

[Zoleka Filander] Being a deep-sea researcher means

having front row tickets to the best movie that everybody

wants to watch.

[James Cameron] Melissa Márquez...

[Melissa Márquez] Straight ahead, 12:00.

[James Cameron] Shark biologist.

[Melissa Márquez] We just saw what no one has seen before.

[James Cameron] Eric Stackpole...

[Eric Stackpole] Scan now!

[James Cameron] Ocean tech innovator.

[Eric Stackpole] I love building tools that allow us

to see things in ways we've never seen before.

[gasps]

[James Cameron] And Aldo Kane...

[Aldo Kane] This is insane.

[James Cameron] Former Royal Marine; special ops.

[Aldo Kane] It doesn't get any more cutting-edge

exploration than this.

[James Cameron] Their secret weapon...

...the OceanXplorer.

The most technologically advanced research vessel

ever built.

There's never been a more urgent need to understand

our ocean and the animals that call it home...

Because their lives and ours depend on it.

This time the team takes on a deep-sea shark.

[Melissa Márquez] She's huge.

[James Cameron] And get closer than they ever imagined.

[Melissa Márquez] Oh she just hit the sub.

[theme music plays]

[seagulls cawing]

[James Cameron] The OceanXplorer is in the Azores.

A group of volcanic islands

in the middle of the Atlantic Ocean,

1,000 miles west of Portugal.

For this mission, the team is heading into the deep.

To uncover the secrets of one of the ocean's

most elusive creatures.

The sixgill shark.

These animals live at depths of over 4,000 feet...

and are so perfectly adapted to the abyss, it's believed

they've barely evolved in 200 million years...

they're as old as the dinosaurs.

Sixgill sharks are secretive,

I've spent hundreds of hours in subs,

I've only ever caught glimpses.

They can live so deep they're really difficult to study,

so the team is here to push the scientific frontiers of

what we know about these animals.

[Captain] We will be rolling the subs out in just a

couple of minutes.

[James Cameron] To reveal the shark's mysteries, the team

will make a series of dives into the sixgill's world.

[Eric Stackpole] I've always been fascinated by the deep

because it is so unusual, it has this feeling of being

scary but your curiosity makes you go anyway.

[Captain] Move into position for the sub launch.

[James Cameron] Their ultimate goal is to tag a shark

in an ambitious plan.

[Zolenka Filander] Nobody has managed to tag a sixgill shark

from a sub at depth and get the data back, so what we're

doing here is really pushing the boundaries.

[Captain] Ready for passengers.

[James Cameron] Melissa Márquez studied sharks for her PhD,

but she's never come face to face with a sixgill.

[Melissa Márquez] I'm gonna be a little intimidated if I've got

a sixgill coming straight at us in the sub.

I mean these big animals and it definitely, if it wants to

clamp on to some part of the sub and shake us around a bit.

Just through here?

[Pilot] Just this way, up the steps, sit here hands either

side and lower yourself down.

[Melissa Márquez] So yeah a little bit nervous of getting

up close and personal with them but really, really excited.

[James Cameron] The team is joining forces with Jorge Fontes

and Pedro Afonso,

shark scientists from the University of the Azores.

[Pedro Afonso] There's amazingly little known about

these creatures, in spite of the fact that they are

the top predator.

Right can I...

[Pilot] Yeah, just put your feet there and then down

on to the seat.

It's good.

[James Cameron] The first mission is to observe these

well-adapted sixgills, which survive in a cold, dark world

of intense pressure and to get an idea of how many there are

in this area.

[OceanX Crew] Clear!

[Pilot] Neptune hatch secure, life support running,

safety brief complete, ready for the water.

[Pedro Afonso] It's really happening.

[Melissa Márquez] It is.

[Pilot] You ever been in a sub before?

[Pedro Afonso] Nope, my first.

[James Cameron] It's 10:30 pm.

Pedro knows where the sharks hang out at night, but until

now he hasn't had a chance to go there.

[Pilot] Ok bridge all ready.

[OceanX Crew] All stations SO, launching Neptune.

[James Cameron] We know that the sharks spend their days in

the depths of the ocean, and that every sunset they start

an epic three hour journey

nearly 1,800 feet up to this island ledge.

Melissa and Pedro are hoping to meet them there.

[Melissa Márquez] Down here light barely penetrates,

and temperatures are just above freezing.

[Pilot] See the bottom?

- Yep, yep. - Yeah, really close

[Pedro Afonso] Now we see it.

OK here we go.

[Melissa Márquez] Just so much biomass here, there's got to

be some sort of nutrient rich water here,

some sort of upwelling,

to explain just how much we've got going on right now.

[James Cameron] Melissa and Pedro will stake out this

ledge for eight hours.

Just 20 minutes in, a shape emerges out of the darkness.

[Melissa Márquez] Shark, shark, shark,

[Pilot] OK, here we go... Port side, port side.

[James Cameron] A sixgill shark.

[Melissa Márquez] That's huge!

Adult, definitely an adult, about 15 feet long.

[Pedro Afonso] Female, no yeah

[Melissa Márquez] Yeah female.

[James Cameron] Males are identified by their claspers,

their sexual organs under the pelvic fin.

[Melissa Márquez] It's so interesting,

that she's so sluggish.

Guess she is conserving her energy, I mean it's cold out

there, it's only 39 degrees.

[James Cameron] The sixgill is different from almost

all modern sharks.

It has six pairs of gills, instead of the more normal five.

A relic from the ancient conditions they evolved in.

[Pedro Afonso] They really look like a prehistoric creature.

[Melissa Márquez] Literally unchanged since the Jurassic,

perfectly adapted.

Sixgill sharks are the masters of the deep,

they've got specialized eyes that actually allow them to see

in really low light conditions down there

and that area is pretty hypoxic,

so there's not that much oxygen.

So their blood is actually adapted to being able to

extract more oxygen from its surroundings, so these animals

can actually thrive down there.

[James Cameron] This close encounter is a good start,

but we need to know more about these Jurassic sharks.

[James Cameron] No one knows how many sixgills are living

here so Melissa and Pedro are carrying out a population

survey throughout the night.

[Pedro Afonso] Think it is, yes, it's coming.

[Melissa Márquez] Do you see it?

Oh yes, yes there it is.

[Pedro Afonso] Yep. It's coming.

[Melissa Márquez] Ohhh shark.

[Pedro Afonso] Shark?

[Melissa Márquez] Yep.

[Pedro Afonso] A small one...

Ah... not so small.

[Melissa Márquez] No, not so small.

These sharks were showing

all different types of personalities.

She's under. She's under.

[Pilot] A hell of a big shark.

[Melissa Márquez] Some were really interested in the sub.

[Pedro Afonso] That's a big tail.

[Melissa Márquez] Woohoo, it's really close.

[Pedro Afonso] You can feel the power.

[Melissa Márquez] Some wanted nothing to do with it.

[James Cameron] As the hours go by, they count 11 sixgills,

one juvenile male and ten females.

[Melissa Márquez] It's interesting that we haven't

really seen any males here, just that one, it's mostly

just been females, no boys allowed, females only hangout.

[James Cameron] Shark mating be violent and outside the

breeding season many species of shark carry out segregation

of the sexes, it looks like this could be happening here.

Our team has confirmed that this is a sixgill hotspot.

Now the likely reason they come here is to feed,

but how are they hunting?

To find that out the team is attempting to tag a sixgill

from a sub.

The submersible team has fitted the tag deployment rig.

[Pilot] Set of lasers here, and that will give you an

approximate position within a few centimeters.

[Zolenka Filander] The whole team is feeling tons of

pressure, because there's so many things that could

go wrong, when doing this from a sub.

[Eric Stackpole] Everything's got to line up perfectly to

make sure we get this once in a lifetime shot.

[James Cameron] There's only been one previous attempt to

tag a sixgill from a sub, but the data was never recovered.

For this mission,

Pedro and Jorge have developed a hi-tech prototype.

[Pedro Afonso] These electronic tags allow us to go

much further into a window onto their behavior,

they combine very, very fine scale sensors that tell you

the movements of the animals.

[James Cameron] Succeeding in this mission, will mean

getting even closer to the sharks.

All the planning has come down to this dive, the pressure is on

for Melissa and sixgill researcher Jorge Fontes.

[Jorge Fones] We just need to find the right shark with the

right attitude.

That has to be confident and get in the right place at the

right time, so the tension builds up.

[James Cameron] The tagging system is carefully primed,

ready for firing.

[OceanX Crew] I think we're good.

[Eric Stackpole] Ok guys what do you think?

[OceanX Crew] Yeah looks good.

[Eric Stackpole] This is gonna be shark bait, this is

basically the way that we're gonna get the sixgills to come

towards the sub...

Oh god that's gross... I'm gonna smell for days.

[OceanX Crew] All stations, all stations SO.

Launching Neptune.

[James Cameron] The sub is diving in parallel with the ROV,

the Remotely Operated Vehicle,

which sends a live feed back to the control room,

where the rest of the team can watch and hope.

[Eric Stackpole] There it is, lower right.

[Zolenka Filander] Observing animals in the deep is

one thing, but trying to tag one at depth,

that's a different ball game altogether.

[James Cameron] As the sub descends to the sharks' hangout,

they encounter a shoal of boarfish.

[Melissa Márquez] Wow.

[Pilot] Woah, look at that.

[Melissa Márquez] It's a really dense aggregation,

the lights of the sub could be illuminating the plankton they

feed on and they've come in to eat.

[Jorge Fones] These guys are bait fish, everybody

eats these guys.

[Melissa Márquez] Have you ever seen so many fishies?

[Pilot] At very very few places, this is pretty wild.

[Eric Stackpole] These boarfish are everywhere.

[Zolenka Filander] Yeah. Feeding frenzy.

[Eric Stackpole] Is it just cos of the bait, it's got to be.

[Zolenka Filander] Could be the lights.

[Pilot] Control, Neptune I have you loud and clear

on bottom 255 meters.

[Control] Copy Neptune.

[Pilot] OK I'm gonna hand that to you.

[James Cameron] It's midnight and the sharks have completed

their journeys from the deep,

but will they come towards the sub?

[♪ mysterious music]

[Melissa Márquez] Come on big mamma.

[♪ mysterious music]

Hey, you guys we got a shark, yeah coming in coming in,

it's coming this way.

[Zolenka Filander] Wow.

[Eric Stackpole] OK well here we are.

[Melissa Márquez] I love how she's really just taking her

time just assessing the situation.

[Eric Stackpole] It doesn't seem super excited about the bait.

[Zolenka Filander] I wonder what's distracting it.

[Melissa Márquez] Come this way.

[Pedro Afonso] Come on.

[James Cameron] This adult female has detected a morsel

of fallen bait, and avoids going up to the sub to feed.

[Melissa Márquez] Oh you're kidding me.

You cheeky girl.

[Eric Stackpole] The sub team must be so frustrated right now.

[Zolenka Filander] I'm frustrated.

[laughs].

[Melissa Márquez] I have lost sight of her.

Oh big shark!

There's two.

[Eric Stackpole] Oh there's two of them now.

Oh my gosh.

[Jorge Fones] Well that might get them competing for the bait.

[James Cameron] Sixgills will congregate if there's food

around, and that can lead to aggressive behavior.

[Melissa Márquez] OK we've got that second one right there.

[Jorge Fones] OK.

[slam]

[Melissa Márquez] Woah, she just hit the sub.

[Pilot] It just hit the sub.

[Jorge Fones] He's under the sub.

[Melissa Márquez] Ohh it is mad.

[whistles].

[James Cameron] With a shark in direct competition, this

female has made it clear she is large and in charge.

[Pilot] You're not armed.

When you want to be armed you let me know.

[Jorge Fones] This is a good time.

It would be a good time now.

[Melissa Márquez] Come on come on.

[Pilot] Ok lasers are on.

[Jorge Fones] Number one right?

[Pilot] Alright, it's armed.

[Eric Stackpole] OK this could be it.

[Melissa Márquez] Alright it's heading this way.

[Jorge Fones] Slow.

[Eric Stackpole] He's gonna take it, he's gonna take it,

take the shot.

[click]

[Jorge Fones] Ah damn it.

[Eric Stackpole] Oh!

[Melissa Márquez] Huh, I can't believe it.

[James Cameron] Jorge overshot by a matter of inches.

[Melissa Márquez] We're not done!

[Pilot] We have one spare.

[James Cameron] If they can't get this tag on,

they will fail in their mission.

[Melissa Márquez] Oh there we go.

[James Cameron] Another sixgill,

this one is alone and she's focused on the bait.

[Jorge Fones] Smell that nice blood.

- Yeah there you go. - Yeah!

[James Cameron] The shark needs to follow the end of the

pole to the bait, and line up precisely in the laser beam.

[Jorge Fones] This is a big shark.

[Eric Stackpole] This is it, you got this.

[Pilot] Wait until you see the lasers.

[Eric Stackpole] This is it.

[Melissa Márquez] Right here come this way this way this way.

[click]

[Pilot] Nice one.

Camera tag away, camera tag away.

[Melissa Márquez] You did it!

[Eric Stackpole] They got it. It's tagged.

- Oh yeah. - Hey, hey.

[slap, laughing]

[Zolenka Filander] Wow.

[James Cameron] The tag is suspended

six feet above the shark,

they can now, for the first time,

follow its movements in detail through the deep.

[Eric Stackpole] Here, here's a shark coming right towards us

and I think that's the tag.

This is the one we were holding just moments ago...

this was in our lab up on the desk.

[Pedro Afonso] That's really cool.

[Eric Stackpole] I'm really excited, we've successfully

tagged a shark,

and if all the electronics are working properly,

and the software's working properly, we're recording data

that basically no one has ever had before.

[James Cameron] But the shark is in no rush to leave.

[Pilot] You're back for more huh?

[Melissa Márquez] You can, you can have some fish yes.

[Zolenka Filander] Look at her eye, look at it roll back.

Sixgill sharks don't have that nictitating membrane so they

need a way to somewhat protect their eye, just in case the

prey fights back.

[James Cameron] The tag won't hurt the shark...

its sensors record speed, depth and movement,

for the next 12 hours,

then it detaches and floats to the surface.

But if the team can't recover it,

they won't find out how the sixgills are hunting.

[seagulls cawing]

[James Cameron] The next day, the tag has surfaced and

pinged a satellite with its GPS coordinates.

[Aldo Kane] So I'm going out to collect the tag, if I can't

get the tag, then all that data will be lost,

and that means all the hard work of tagging the shark

will be in vain.

[James Cameron] The precious tag is being swept dangerously

close to the cliffs.

[Pedro Afonso] Guys.

Keep your eyes on the water now.

[Aldo Kane] Tag, tag.

[Driver] OK Aldo I'll get on the starboard side of it so

you grab it on portside.

[Aldo Kane] Yeah. Do you see it?

[Driver] Yeah seen.

[Jorge Fones] Oh man this is close huh?

[James Cameron] Aldo has one chance to pluck the tag

from the swell.

[Jorge Fones] Alright. Alright.

[Aldo Kane] There we go.

[Jorge Fones] Good job, man.

[Aldo Kane] Good job.

[James Cameron] The tag has been successfully retrieved,

but what's it going to show us?

The information from the sixgill tag has been processed

and the results are ready to be revealed.

[Melissa Márquez] What have you got for us?

[Eric Stackpole] I have got some of the best footage

captured from our many hours of shark exploration.

Shall we hit it maestro, ok here we go.

So this obviously is the light from the sub

as seen from the shark.

[Melissa Márquez] That's the sea floor.

[Eric Stackpole] And I noticed in some other parts of the

footage, you can actually see the fish scattering...

[Melissa Márquez] Yeah.

[Eric Stackpole] As the shark moved through.

This is kind of how the shark sees it, you know so

you almost get, you get in the mind of the shark.

There's Jorge.

[laughs].

[Melissa Márquez] I've taken so many pictures of sharks in

my studies, now a shark's taking my picture!

[Eric Stackpole] Now it's chomping down on the bait.

[Jorge Fones] The motion sensors on the tag will detect

when the shark is eating, even if you don't have video.

[Eric Stackpole] Oh right because it's bobbing

up and down.

[James Cameron] But can the other sensors reveal how the

shark may be hunting here?

[Jorge Fones] Here on the top line, will be depth.

So we can see that from here

he was going away from the sub for periods,

because he's going deeper and then he's coming back up,

then he's going deeper, he's coming back up.

So, he's roaming, he's exploring.

Then you can see as we go over, that this is a big climb.

[Melissa Márquez] Yep.

[Jorge Fones] You know it's climbed up to 200 meters, then

it goes back down again, and then the nice thing is towards

the end of the deployment it just starts going down and

this is when... sun is about to rise.

[Melissa Márquez] Sunrises.

[Eric Stackpole] So as the sun's coming up the last thing

we see this shark doing is going down deeper into the abyss.

[Jorge Fones] Straight down.

Here you have speed, so you can see speed changed

you know, varied a little bit.

[Eric Stackpole] Do you see a few places like here and here

where the speed increases rapidly for a moment.

What do you think happened there?

[Melissa Márquez] Could it be predation?

[Jorge Fones] Could be.

[Eric Stackpole] And you know it's interesting that it's

coming up because I know a lot of these predators,

they look for silhouettes.

I mean I guess there's no light at this point I thought

maybe it could...

[Jorge Fones] Maybe enough for them, you know, just moonlight

is enough for them to see a silhouette...

[Eric Stackpole] Wow.

[Jorge Fones] Because they have very sensitive eyes.

[Eric Stackpole] So, so it could have come from below,

seen its prey come up, eaten it, that's what this spike is

then it's gone back down or something.

[Jorge Fones] It could be.

[James Cameron] The shark's upward movements are intriguing

and may be helped by its huge oil filled liver,

that accounts for over 20% of its body mass

and makes it buoyant.

This buoyancy could be behind its hunting strategy.

[Melissa Márquez] Some scientists suggest that

sixgills are ambush predators gliding up to capture their

prey, they just hit 'em from below.

[Eric Stackpole] Yeah I mean we know from their gut content

that they're mostly eating things

- that are way faster than they are. - [Jorge Fones] Yeah.

[Eric Stackpole] So stealth gliding to sneak up on their

prey makes a lot of sense.

[James Cameron] The tag results suggest an interesting

hypothesis on how the shark may be hunting,

but our guys need more information.

Can they capture footage of a sixgill actually predating?

To give themselves the best chance, they have to time

their dive perfectly to when there's maximum prey.

We know that at night many creatures come up to feed.

A mass vertical migration occurs in all the world's oceans,

triggered by the rise of plankton,

fish, jellies and squid travel through

the ocean's twilight zone,

and following them, larger creatures.

If they can hit the peak of this vertical migration,

Melissa and Pedro may have a chance of recording

a sixgill on the hunt.

[Pedro Afonso] Keep that biologist's sharp eye on

the camera, yeah?

[Melissa Márquez] No pressure.

[James Cameron] Aldo's also preparing a dive, but his will

be in the shallows, to understand the scale of the

vertical migration in the Azores.

As a former special ops Royal Marine,

Aldo is the only member of the team

with the experience to lead this night dive.

[Aldo Kane] When you have moving boats and diving operations

and then you add into the mix nighttime operations

you can quickly and easily lose control of things.

[James Cameron] It's 11:30pm,

only if they've timed their dive perfectly,

will they fully experience the vertical migration.

[OceanX Crew] OK guys are you ready, so 3, 2, 1 go.

[splashing]

[James Cameron] Guided in the darkness by his dive computer,

Aldo descends 60 feet.

Immediately he's engulfed by

the smallest creatures in the ocean,

the plankton, that underlie the entire food chain.

[Aldo Kane] This is the vertical migration that

we're talking about,

all of these fish coming in to feed on the plankton

which has made its way up to the surface.

It's amazing, look at all the fish coming in below us now.

[James Cameron] Tonight, the rise of the plankton is

followed by something else...

purple stinger jellyfish.

[Aldo Kane] It's amazing seeing them all migrating

up to the surface.

[James Cameron] What appears to be a few at first,

grows into a mass bloom.

[Aldo Kane] I've never seen anything like this.

This is literally thousands and thousands of jellies.

It's one of the strangest things I've ever seen,

they're just stunningly beautiful, ha-ha in its own way

[James Cameron] The vertical migration is at its peak.

The deeper waters are now rich with shoals of fish,

and the ledge where the sharks make their nightly visits,

is a hive of activity.

It's dinner time.

[Pedro Afonso] It's an Angler fish.

See that's the lure, look.

[Melissa Márquez] Oh yeah.

[Pedro Afonso] He's lifting the lure right.

[Melissa Márquez] Yeah, yeah, yeah.

[Pedro Afonso] See he's waving the lure.

[Melissa Márquez] Yeah.

[Pedro Afonso] That's what he uses to attract the prey, then.

A bunch of rays around.

[Melissa Márquez] That's so cool.

We just saw a predation.

[James Cameron] Conger eels rely on the vertical migration

for food.

[Pedro Afonso] They're in feeding mode, that's for sure.

[Melissa Márquez] Yeah.

Actually, being down in the sub and putting faces to the

animals that make up this migration, you've got fish

eating smaller fish, you've got the skates and the rays

burying themselves and eating their own fish.

This happens on a massive scale, every single night in

our ocean and the fact that I got to kind of sit in the

middle of it and observe it all is mind-blowing.

[James Cameron] These large creatures are perfect prey for

sixgills, but can the team film the sharks actually hunting?

[♪ mysterious music]

This female has completed

her three hour journey up from the depths.

[Melissa Márquez] There we go,

now it's coming a little bit closer.

Yeah cos I got her on camera.

[Pedro Afonso] Yeah she is.

[James Cameron] She's staying close to the seafloor.

[♪ mysterious music]

[Pilot] Something's got her interest.

[James Cameron] A conger eel.

[♪ mysterious music]

The conger eel escapes,

but this sixgill is on the prowl

and she's not the only one interested in the seabed.

[Melissa Márquez] Oop, there we go.

[Pilot] Yeah, yeah.

[Melissa Márquez] She's really low to the ground.

[James Cameron] Like all sharks, sixgills have highly sensitive

electrical sensors around the nose,

which can detect the smallest muscle twitch of its prey.

She may be seeking rays hiding out under the sand.

Suddenly she makes a move.

She thrusts with her tail, to get on top of the prey.

[Melissa Márquez] Do you see anything in its mouth?

[James Cameron] Capturing this behavior on camera

is incredibly special

and will help the team understand how

this top predator hunts.

[Pedro Afonso] Oh man that is quite something.

See why we want to study these guys?

[Melissa Márquez] Yeah of course.

As a scientist you always hope you get to experience the

rare and extraordinary,

it doesn't get much rarer than this.

[Aldo Kane] That footage is incredible, has that been

filmed before?

[Melissa Márquez] No we don't think so, which makes it even

more exciting, because it's probably a first for science

and you know you don't really get that that often.

You know the data from the tag was telling us one thing,

but our own eyes are telling us something

completely different.

[Eric Stackpole] Right on the tag data I assumed it was like

an ambush predator where it sees maybe like the silhouette

from below, it snatches its prey.

[Melissa Márquez] But that's not what we saw here,

it's using its positive buoyancy to actually lift up its rear end

so its nose eventually actually points down in to the

sand once it finds prey and with that really powerful tail

grind down into the sand.

[Aldo Kane] So it's using its positive buoyancy to,

to glide up the gradient and then pin whatever it is,

the ray, down in to the sea bed.

[Melissa Márquez] That's it and that's not to negate the

theory that we got from the tag it just means they might

be using different hunting tactics for different prey.

It's mind blowing to see a brand new to science data point

that we didn't have for these animals before.

[Eric Stackpole] I'd call this a pretty successful mission.

[Melissa Márquez] Oh 100%! 100%.

[James Cameron] In their time here, the team has gained

important new insights into the lives of the sixgill sharks.

They've observed how they're perfectly adapted to the abyss.

[Melissa Márquez] It's so interesting seeing them be

so sluggish.

[James Cameron] Discovered their different personalities.

[Melissa Márquez] You cheeky girl.

[James Cameron] And confirmed that a large population of

females live here.

[Melissa Márquez] Only a handful of people have been

able to see these sharks from a sub, at depth,

with their own eyes, I feel really lucky to be one of them.

[Eric Stackpole] There it is, lower right.

[James Cameron] By successfully tagging a sixgill

from a sub...

- You did it! - Oh yeah.

[James Cameron] They've gained a whole new set

of scientific data.

[Eric Stackpole] This is awesome guys.

What we've done has paved the way for sixgill research and

it has been awesome to be a part of this mission.

[James Cameron] They've explored these rich waters of

the Azores at night.

[Aldo Kane] It's one of the strangest things I've ever seen.

Being in the middle of that vertical migration

was just unbelievable.

[James Cameron] The greatest achievement,

has been capturing the sixgill's predation behavior.

[Zolenka Filander] We know so little about the residents of

the deep, but today we have gained some valuable insights

on how these prehistoric animals have survived.

[James Cameron] Some of the sixgill's secrets have been

uncovered, but there's still so much more to learn

about these mysterious sharks of the abyss.