All language subtitles for BBC.Blue.Planet.II.Part.8.Oceans.of.Wonder.PDTV.x264.AAC.mp4[eztv]

The oceans, seemingly limitless,

invoke in us a sense of awe

and wonder, and also sometimes fear.

They cover 70% of the
surface of our planet,

and yet they are still
the least explored.

Hidden beneath the waves,
right beneath my feet,

there are creatures
beyond our imagination.

With revolutionary technology,
we can enter new worlds...

..and shine a light on behaviours in
ways that were impossible

just a generation ago.

In this extended special,
we celebrate

some of the highlights
from the series.

We will journey across the globe...

..from the warm waters of the
tropics...

..to the coldest seas around the
poles...

..and down into the unexplored
depths...

WHOOSHING

..to bring us a new understanding of
life beneath the waves.

BIRDS SQUAWK

This is Blue Planet II.

The surface of the ocean conceals
the many creatures that

live beneath.

But not all.

Bottlenose dolphins.

They are extremely intelligent.

And with this intelligence
comes playfulness.

They surf...

..and as far as we can tell,
they do so for the sheer joy of it.

But to properly
appreciate their true character...

DOLPHINS SING

..you have to travel with them
into THEIR world.

A pod of bottlenose dolphins
is visiting a

coral reef in the Red Sea.

For the youngsters,
there are things to be learned here.

DOLPHINS SING

The adults lead a calf to
a particular bush-like coral

called a gorgonian.

And here the adults behave rather
strangely.

They deliberately rub
themselves through the fronds.

Their calf seems reluctant to do so.

By watching his elders,

he may be realising that this is
something he ought to do.

Gorgonian fronds, in fact,
are covered with a mucus

that can have anti-inflammatory
and anti-microbial properties.

So maybe the adult
dolphins are doing this to protect

themselves from infection.

The dolphins' intimate
knowledge of the reef is spurring us

to search for new medicines here,
too.

Tropical coral reefs occupy only a
tenth of 1% of the ocean floor.

But their shallow warm waters
and stable year-round conditions

support some of the most crowded
and varied communities

to be found anywhere in the oceans.

And there are new discoveries to
be made on every one of them.

One creature
on Australia's Great Barrier Reef

is challenging our understanding of
fish intelligence.

A tusk fish, and you can see why it
gets its name.

He does something few would have
believed a fish could do.

Every morning,
he travels to the edge of the reef.

He's searching for something special
to eat amongst the coral rubble

and sand.

Here's one.

A small clam.

But how to crack it open
and get to the meat?

He takes it all the way
back to his special kitchen...

..a bowl-shaped coral that has
a particular bump on the inside

that he always uses.

It's not easy

if you have no hands.

Oops!

There it goes again.

But he's got great determination...

..and surprising accuracy.

At last.

So here is a fish that uses tools.

Some fish are much cleverer than
you might suppose.

The density of the animals
on tropical reefs makes

competition inevitable and
extreme...

..not only for those that live
within the reefs,

but for the birds that
fly above them.

BIRDS SQUAWK

During the dry season, over half a
million terns crowd onto

this remote atoll in the
Indian Ocean.

Their chicks are still
in their dark juvenile plumage.

Those just starting to
learn to fly use the

shallow lagoon that occupies
the centre of the atoll

as their training ground.

It's difficult for some of them
to stay aloft for long.

Giant trevallies!

Usually,
they are solitary hunters,

but about 50 of them have come
here from neighbouring reefs,

attracted by this abundance
of potential prey.

The fledglings stay out of the water
if they can.

They even drink on the wing.

If the trevally are to catch one
now, they have to up their game.

So there is a fish here that,
amazingly, has a brain

capable of calculating
the air speed,

altitude and trajectory
of a bird.

The time comes
when every fledgling has

to take to the air and collect food
for itself.

Their parents lead them to the
training grounds.

BIRDS SQUAWK

If they are to survive,
they must learn quickly.

After a month of practising over
the lagoon, the youngsters start

to leave and take their chances
out over the open sea.

The oceans hold 97%
of all the water in the world.

As the sun warms their surface,
water evaporates.

The vapour rises into the sky

until it cools
and condenses into towering clouds.

THUNDER CRASHES

And they generate huge storms.

The spin of the Earth deflects these
storms, north and south,

into cooler latitudes.

As they travel across the sea,

storm-driven winds
create huge swells.

When the swells reach
shallower water,

they rise into gigantic waves.

In its lifetime, a large
storm can release

energy that is the equivalent of
10,000 nuclear bombs.

These are the seasonal seas.

And when they warm in spring,
they can suddenly explode with life.

Mobula rays have
gathered in Mexico's

Sea of Cortez in vast numbers.

Why do they leap?

Is it to tell others
that they're here?

No-one knows.

They feed mostly at night,

for that is when vast swarms
of plankton rise from the depths.

The disturbance in the water
stimulates

many of the planktonic creatures to
luminesce.

Only now do
we have the technology to

record their faint glow.

The feasting rays swim through them,

creating an extraordinary
ballet of life and death.

The richness of these waters
is based on microscopic plants,

phytoplankton, which bloom on

such a massive scale,
they benefit us all.

They, together with seaweeds
and seagrasses,

produce as much oxygen as

all the forests
and grassy plains on land.

In the shallow
waters of the seasonal seas

lie great undersea forests.

Giant kelp towers 60 metres high.

These enchanted
forests are crowded with life.

Creatures jostle for space and food.

In the fiercely competitive kelp
forests off Southern Africa,

survival can demand great ingenuity.

A common octopus.

She is waiting for prey
to pass by.

A crab will do.

The octopus sets off in pursuit...

..and then lurks with
the patience of an ambush hunter.

But the octopus shares the Cape
waters with a great

concentration of other predators.

Fur seals...

..and sharks.

They all eat octopus...

..if they can find one.

And pyjama sharks are experts...

..at hunting in the undergrowth.

Time to disappear.

But these tough-skinned
little sharks are

small enough to reach
deep into crevices.

But the octopus is
far from finished.

She slips her
tentacles into the shark's gills.

That prevents the shark from
breathing.

So the shark HAS to let go.

When caught out in the open
and vulnerable,

this octopus does something
truly extraordinary...

..and never recorded before.

She disguises herself...

..with a protective armour
of shells.

She's hiding in plain sight.

The shark can sense its prey.

But the shells confuse it.

In a forest full of hungry mouths,

superior wits allow this octopus
to stay alive.

In the underwater
forests off northern Japan...

..the residents of this sunken wreck

are waiting for the summer
temperatures to reach

16 degrees Celsius.

That, for some,
is the time for mating.

A kind of giant wrasse
called a kobudai.

This is a male...

..and in female terms,

he's particularly handsome.

He's a metre long
and weighs 15 kilos...

..much larger than
the diminutive female.

And he is ready to breed.

He attempts to mate with her,

and with any of the other
dozen or so females

that live in his territory...

..whenever he gets the chance.

But females from around ten
years old take

little notice of his advances.

This is because, when any large
female reaches a critical

body size, she can begin
a dramatic transformation.

Over just a few months,

particular enzymes inside her body
cease to work...

..and male hormones start to
circulate.

As time passes, her head expands

and her chin gets longer.

A "she" has changed into a "he".

And with this comes
a change in temperament.

The old male who ruled all
the females here...

..is challenged to a face-off.

The more bulbous the head, the more
it intimidates an opponent.

The territory has a new ruler.

Only the largest females transform
themselves in this way.

But the change enables them to have
more mates,

so they will have many more
offspring carrying their genes.

But a new male can't afford to
be complacent.

Inside the body of every
kobudai female

there is a new male-in-waiting.

At the height of summer, there is an

explosion in the population
of another forest resident.

But this one is out to
attack the very forest itself.

Off the Pacific
coast of North America,

armies of sea urchins
cut through the kelp fronds.

Protected by a coat of spines,

with their mouths full of razor
teeth, they fell the great stalks.

Behind them, they leave a wasteland,

known as an urchin barren.

But help is at hand.

Sea otters.

All other kinds of otters
spend much of

their lives on land,
but sea otters rarely

leave the water.

At first, a newly born pup is not
a very good swimmer,

so its mother spends hours
grooming its fur to make it buoyant.

But to provide her youngster with
milk and keep herself warm,

she must eat up to 30%
of her body weight every day.

She does that by eating shellfish.

And urchins are among a sea otter's
favourite delicacies.

In the past, sea otters were
hunted so intensively

for their fur that they came
close to extinction.

With them gone, many kelp forests
were replaced with urchin barrens.

Today, sea otters are protected.

And as their numbers slowly return,

many of the kelp forests are
recovering, too.

Now, in some remote places,
sea otters are so numerous,

they assemble in huge rafts...

..something that hasn't been
seen for over a century.

Coasts are the most swiftly
changing of all ocean habitats...

..because of the tides.

Tides are created as the moon's
gravity pulls at the sea.

As the moon circles our planet,
the seas rise and fall...

..typically twice a day...

..creating the most constantly
dynamic landscapes on Earth.

Nowhere else do sea-living creatures
face such changeable conditions...

..with the daily risk of drying out
and being scorched by the sun.

Where the tide
retreats across a rocky shore,

it can leave behind
a temporary oasis.

A rock pool.

Seemingly, it's a haven of calm.

But not for long.

Turning minutes into seconds reveals

unexpected dramas.

In rock pools, grazers,

scavengers and filter-feeders must
all make the most of

the few short hours before the tide
returns.

Anemones gulp down anything they
can reach...

..though some meals are harder to
digest than others.

LOW RUMBLING

These magical worlds soon become
battlegrounds.

A deadly predator with five arms
and, on the underside, a mouth.

The ochre starfish.

And it's in search of limpets.

For some, there is no escape.

It engulfs them.

But other limpets have a
secret defence.

They deploy a slippery shield...

..which allows them
to slide to safety.

And this limpet has its own personal
bodyguard.

A scale worm, with a nasty nip!

The starfish prefers food that
doesn't bite back.

The limpet carries on,

its bodyguard tucked safe
under its shell.

But there is one creature that
limpets have no defence against.

A clingfish.

It has teeth that can lever
under the shell..

..and twist the limpet
off like a bottle top.

The clingfish then swallows it,
shell and all.

Rock pool dramas like these
last just a few short hours

before the tide returns.

Every day, the sea becomes land,

and the land becomes sea...

..bringing new opportunities.

A Sally Lightfoot crab.

One of thousands of shore crabs just
waiting for their moment.

Every day, they gather on the
rocky shores of Brazil...

..waiting for the tide to go out...

..which exposes their
feeding grounds...

..seaweed-covered rocks,
100 metres from the shore.

Getting there is
a race against the tide.

They leap from rock to rock.

These crabs seem to be afraid
of the water.

And for good reason.

A moray eel.

The chain moray is a specialist
crab-hunter.

Its blunt teeth can easily grip
and crush a crab's shell.

It's the crab's deadliest enemy.

But the crabs' feeding grounds are
still a long way off.

They must press on.

Halfway.

But their enemy has other ideas...

..crossing the land...

..to reset the ambush.

To feed, the crabs must keep going.

But nowhere is safe.

An octopus, also a crab-killer.

The crabs make a dash for it.

Made it!

Risking life and limb to graze on
these seaweed pastures.

But in two hours' time,
when the tide starts to turn,

they will have to run
the gauntlet all over again.

As we leave our coasts and
head for the high seas,

we enter the big blue.

Covering over half our planet's
surface,

it's the world's greatest
wilderness.

Here, there is nowhere to hide
and little to eat.

It's the marine
equivalent of a desert.

But there are rare moments

when these empty
seas are filled with life.

Lanternfish, off the Pacific coast
of Costa Rica.

They're scarcely bigger than
minnows, but what they lack in size,

they make up for in numbers.

They are one of the most
numerous fish anywhere.

Normally, they only come to the
surface at night,

to feed on plankton,

but this immense shoal has
risen during the day,

almost certainly in order to spawn.

For open-ocean hunters,
this would be a bonanza.

DOLPHINS SING

Spinner dolphins.

They're named
after their acrobatic leaps.

They stick together in a super-pod,
5,000 strong.

And now they have located the shoal,
using their echo-sounding calls.

But they have to get to it quickly.

They are not the only hunters here.

Yellowfin tuna have also
detected the shoal.

And behind them, with their
two-metre wingspans, mobula rays.

Now sailfish,
one of the fastest fish in the sea,

have joined the chase.

The lanternfish may return to the
deep at any moment.

But now the dolphins have got here.

DOLPHINS SING

They swim beneath the shoal,
pinning it to the surface

and forcing the lanternfish to
pack more closely together.

And now the sea begins to boil.

The tuna charge into the shoal
at over 40mph.

The slower-swimming rays
arrive at last.

With their immense mouths agape,

they scoop up the lanternfish
by the hundred.

The shoal has now been
largely dispersed,

and the sailfish pick off
the survivors.

In just 15 minutes,
all that's left is a

silvery confetti of scales.

But here,
such feasts are only too infrequent.

Whilst the dolphins perform great
feats of endurance,

others are driven to even greater
extremes

to find food in this ocean desert.

A sleeping giant.

A sperm whale.

This family is
resting between bouts of feeding.

Who knows what the owners
of the biggest brain in the planet

dream about?

One has a calf.

It's about two weeks old, but still
dependent on its mother's milk.

It's hungry.

It communicates
with its mother using a

pattern of clicks.

CLICKING

But its mother slumbers on.

The calf, covered in suckerfish,
of which it can't yet rid itself,

has to be patient.

Sleep over and refreshed,

the whales move on.

Sperm whales don't
wait for their prey to

rise to the surface.

They swim down into
the depths to find it.

They take a series of
heavy breaths...

..to saturate their blood with
oxygen...

..then down they go.

This entire family dives
together in search of squid.

A mother will push her body to the
limits of her endurance,

and already it's hard for her
calf to keep up with her.

CLICKING

The calf sticks to its mother
as closely as it can...

CLICKING

..touching her frequently...

..as if for reassurance.

But 300 metres down,

it seems the calf can't
hold its breath any longer.

In their early years, calves
are forced to sit out the hunt.

The adults continue their dive.

The mother changes her
calls into a series of louder

and more rapid clicks.

CLICKING

She's now using sonar to
hunt down shoals of squid.

At 800 metres, a burst of clicks.

CLICKING QUICKENS

Then silence.

She's made a catch.

A calf can have a long
wait at the surface.

A mother returns from the deep
after as much as an hour.

She has a stomach full of squid.

Finally, this hungry calf can
take some milk.

It's one of the richest
produced by any mammal,

and the calf guzzles a bath full
of it a day.

It may be six years before a calf
masters the art of deep diving

and is able to find food for itself.

Over half of all animals in the
open ocean drift in currents.

Jellyfish cross entire oceans,

feeding on whatever happens

to tangle with their tentacles.

And when, by lucky chance,

they encounter a patch of sea
rich in plankton...

..their numbers explode.

It's such a successful strategy that
jellies are

one of the most common life forms
on the planet.

But among the jellies,
and looking somewhat like them,

is a rather more complex
and sinister creature.

The Portuguese man o' war.

It floats with the help
of a gas-filled bladder,

topped by a vertical membrane.

With that serving as a sail,
it maintains a

steady course through the waves.

Long tentacles trail behind it.

Each is armed with many thousands of
stinging cells.

A single tentacle could kill a fish
or, in rare cases, a human.

A tentacle has caught this one
and reels it in.

It's already paralysed.

This voracious man o' war
may collect

over 100 small fish in a day.

BIRDS SQUAWK

Parts of the open ocean are deeper
than the highest mountains

that rise on the land.

Now we can dive these uncharted
depths to discover what

secrets lie beneath.

The deep ocean is as challenging
to explore as space.

Ready to carry on with the launch.
All clear.

We know more
about the surface of Mars

than we do about the deepest
parts of our seas.

As we descend into the deep,

the pressure increases...

..and the lights from above
all but disappears.

INDISTINCT RADIO CHATTER

200 metres down,
we enter an alien world...

..the twilight zone,

a sea of eternal gloom.

Survival here means making
the most of every last glimmer.

A squid, but this is one that lives
only here.

Its right eye looks
permanently downwards.

But its left eye is much bigger and
trained upwards to detect the

silhouettes of prey swimming
nearer the surface.

No wonder it's nicknamed
"the cockeyed squid".

And even stranger...

this is barreleye...

..a fish with a transparent head,

filled with jelly,
so that it can look up

through its skull.

We now know that the
twilight zone is a

refuge for an incredible 90%
of all fish in the ocean.

CRASHING THUD

Humboldt squid.

Two metres long

and 50 kilos in weight.

Like most squid,
they're voracious hunters.

They've found
a shoal of lanternfish,

hiding 800 metres down,
off the coast of South America.

Their tentacles are armed with
powerful suckers

with which they grab their prey.

And when there are no more
lanternfish to be found,

they turn on each other.

This squid has caught a smaller
one in its tentacles.

To hide its capture from the rest,

it releases
a smokescreen of black ink.

But then an even bigger one
challenges it...

..and steals its catch.

Below the twilight zone
lies a world

of perpetual blackness...

..leading, eventually,
to the deep sea floor.

Here, there is a layer of mud,
in places a mile thick.

The deep seabed may at first
appear lifeless...

..but it's home to a unique
cast of mud-dwellers.

The sea toad.

This fish has been living for
so long here that its fins have

changed into something
more useful.

Feet.

They help it
shuffle about on the sea floor.

The flapjack octopus.

It hovers just
above the surface of the mud

as it delicately sifts through it,
searching for worms.

Down here, over time, organic matter
slowly decays...

WHOOSHING

..creating a volcano of methane gas.

RUMBLING AND WHOOSHING

In the Gulf of Mexico,

these eruptions also release
a super-salty liquid.

Brine.

Heavier than seawater,

it accumulates in great
pools on the sea floor.

A lake of concentrated saltwater,
15 metres deep,

at the bottom of the sea.

Cut-throat eels, scavengers,

come to the shores of the brine lake

in search of something edible.

Spending too long in it can send
an eel into toxic shock.

Its only hope is to rise above it.

It manages to escape.

Conditions in the deep sea
may be hostile...

..but, astonishingly,
there is more life

down here than anywhere
else on Earth.

As far down as 3½ miles,
there are more

species of coral in the deep
than on the shallow tropical reefs.

The deep may be full of alien-like
creatures,

but we are more closely
connected to it

than we ever thought possible...

..thanks to great ocean currents.

These currents
begin in the frozen poles.

Antarctica.

Here, the surface waters are so cold
and heavy that they sink...

..and that creates immense rivers
of water that flow into the deep.

This is the start of a giant
network of currents...

..that flow from the
poles to the tropics

and back again...

..linking every ocean.

These currents are in fact crucial
to the wellbeing of our planet.

They distribute the sun's heat,

maintaining a favourable
climate for life on Earth.

From creating the weather
to producing oxygen,

the seas keep our world healthy.

But just as we are discovering
how dependent we are on the oceans,

there are worrying signs that they
are warming at a faster rate than

ever before in human history.

And nowhere is this more
extreme than in the Arctic.

Here, in the past 30 years,

the extent of the ice in summer has
been reduced by 40%.

This sudden warming,

most likely a consequence
of human activity,

is having a profound
impact on its wildlife.

Walruses are among those
that are seriously affected.

LOW GROWLING

The sea ice is retreating from much
of the walrus's traditional range,

so they now have to haul out
on dry land.

But a herd of hundreds
of quarrelsome mothers,

some weighing almost a ton,
is not an ideal nursery.

THEY GRUNT AND GROWL

Walruses on land stick
together for good reason.

Polar bears.

A full-grown male walrus
is gigantic -

too big for even
a polar bear to tackle.

So the bear is
looking for a walrus baby.

THEY SNARL

The scent of the bear spreads alarm
through the colony.

The walruses retreat into the sea.

The bear knows it won't be able to
catch them there.

But she too has young ones to feed.

What is a mother to do?

WALRUS BARKS

A mother walrus still
needs to find a place

where her young can rest.

A melting iceberg might do.

But she is not
the first to find this one.

Suitable places are already taken.

Other mothers don't want to share.

They too need
a patch of ice where they

can protect their young.

The desperate mother has no choice
but to barge her way in.

THEY GROWL AND SNARL

So, this time, everyone loses.

Finding the right
place on these melting shores

gets harder and harder.

Solving these problems together
helps create a bond so strong that

the mother will stay in contact with
her young for the rest of her life.

But who knows now
what their future will be?

As we understand more about the
complexity of the lives

of sea creatures,

so we begin to appreciate the
fragility of their home.

We are at a unique
stage in our history.

Never before have we had such
an awareness of what we are

doing to the planet,

and never before have we
had the power

to do something about that.

Surely we have a responsibility to
care for our Blue Planet.

The future of humanity,

and indeed all life on Earth,

now depends on us.

To find out
more about our oceans with

this free poster, call...

..or go to...

..and follow
the links to the Open University.