Original subtitles

Summer in the polar regions

and the sun never sets.

Imagine a single day that lasts for months.

Some polar animals will face great challenges

as their ice world vanishes around them.

Others must use this special time wisely,

for summer's riches will not last.

The summer is just beginning and the increasing power of the sun

is creating a spectacular new landscape.

This melting ice sheet in the Arctic is 150 miles long

with a thousand waterfalls.

Vast expanses of ice that were once stone-still have come to life.

The polar bear's world is melting away under the constant summer sun.

As the season advances,

the frozen surface of the ocean disintegrates.

Soon, the ice here will have totally vanished.

The polar bear family have to adapt to their rapidly changing home.

For the two cubs, this is a whole new watery world.

It's the first time they have seen the sea-ice break up.

They're only six months old

and will be dependent on their mother for another two years.

They have much to learn.

Their first swimming lesson,

and they're not sure that they want it.

For their mother, swimming is second nature.

But the cubs still prefer to have ice beneath their feet whenever they can.

Soon, it will be impossible to avoid the water.

This lone male has lived through a dozen summers

and is perfectly at home in the sea.

He can swim up to 50 miles a day.

He's hungry and he's searching this ice maze for seals.

But travelling across this increasingly fragile ice-scape

is hard work for an animal weighing over half a ton.

It's also harder to hunt when you have to swim.

In open water, the odds are in the seals' favor.

Lean months lie ahead for the polar bears.

They will have to adopt new hunting strategies or risk starvation.

The northern part of the earth is now tilting towards the sun

and all around the Arctic the sea-ice continues its retreat.

The last remnants of the ice-world drift with the wind and the tides.

The sun's heat may be gentle at these latitudes,

but it is continuous for 24 hours a day

and it carves the ice into magical shapes.

Those that need ice have to visit the glacier fronts to find it.

A comfortable bed is hard to come by.

A polar bear's fur is so dense that water is easily shaken off.

And ice absorbs water like a towel.

That's better!

There's now little chance of catching seals

and this bear may not eat again until the end of summer.

It's better to save energy and doze in the sun.

The warmth of the sun's rays is now bringing the Arctic lands back to life.

Red phalaropes.

They've flown all the way from the tropics

to feed in these rich Arctic waters.

They stir up the tiny creatures that are now flourishing here

with a special spinning dance.

All excellent fuel, as they hurry to rear the next generation.

The Arctic terns have made an even longer journey to breed here.

They have flown 11 ,000 miles from the Antarctic.

Their newly hatched chicks will need to grow fast

if they're to accompany their parents

when they return south in only six weeks' time.

An eider duck has chosen to nest in the center of the tern colony,

hardly a tranquil place to raise your young.

But the noisy neighbors have a feisty attitude to life

and that can be very valuable.

A hungry bear looking for a meal

can destroy hundreds of nests in a single raid.

Defensive squadrons of terns take off immediately.

Sharp beaks stab down from above.

The bear has nothing in his armory that can cope with this.

The terns have drawn blood from his muzzle.

He leaves, in search of an easier meal.

The eiders survive thanks to their choice of neighbors.

And the ducklings begin their sprint to maturity.

Fishing continues around the clock

as the terns race to rear their young before the return of the freeze.

So the rich waters of summer fuel the breeding of all these visitors

and enable them to build up the reserves they will need

for the long return journey south.

Inland, the winter snows have gone, revealing a vast, treeless wilderness.

The male snowy owl is finding plenty of lemmings to bring to his mate.

But they're not just for her.

She is brooding their rather scruffy young.

She tears the meal into beak-sized chunks

that the owlets can swallow whole.

Each of them can eat two lemmings a day.

The male has no time to rest.

Over the course of the summer, he will have to provide his family

with over a thousand lemmings.

The hungry owlets keep the adults working around the clock.

The arctic summer may be short but the days are long.

Everyone must take advantage of the 24-hour daylight,

none more so than the owls' tiny neighbors,

the Lapland buntings.

Both parents feed their growing family continuously.

A mere 10 days after hatching

and they will all have left in record time.

The last needs a little encouragement.

The owlets have also left their nest

and turned into football-sized balls of fluff.

But they still depend on their parents for food and protection.

A skua.

Their mother's talons are her best weapons.

The owlets are dangerously exposed out on the tundra,

so they must hurry to change from balls of fluff

to fully-feathered adults.

And to do that they need more lemmings.

A lemming doesn't last long these days.

Times are harder for the wolves here in the high Arctic.

The cubs are now six weeks old and increasingly hungry.

The adults have to struggle to feed their growing family.

Somewhere on this vast expanse of tundra

there must be larger prey.

Musk oxen are on the move.

They're heading into the valleys, where the brief summer rains

will produce fresh grazing.

This is an opportunity that must be seized,

even if it means travelling 80 miles in a day.

Their task is a formidable one.

Musk oxen are immensely powerful

and their sharp horns can kill.

A heavily armored bull would be an unwise choice.

Even two wolves would find it a struggle to bring it down.

A calf.

Much easier.

The two wolves work together to split the herd and isolate their victim.

It seems that the wolf cubs will at last eat well.

But the herd regroups.

The cavalry ride to the rescue.

The whole herd encircles the calf with a protective wall of horns.

For the musk oxen, it's all for one and one for all.

For the wolves, another attack would be not only futile but dangerous.

They have spent a lot of energy

and have nothing whatever to show for it.

Their failure will be felt most keenly back at the den.

They have nothing to take back to the family.

The pack are forced to move on in search of better hunting.

They must find something soon

in this vast wilderness to feed their growing family.

The brief Arctic summer is almost over.

At the southern end of the planet, the long summer days transform life,

just as they do in the north, but the cast here is very different.

King penguins.

A parent, returning with food, must recognize its chick's call

amongst a chorus of 400,000 birds.

Huge colonies like this one

are found all along the north coast of South Georgia.

King penguins are active throughout the long summer days,

so they have to deal with an uncharacteristic polar problem.

By midday, the temperature can reach a sizzling 17 degrees centigrade.

Any effort can lead to overheating.

It's best not to overexert oneself.

The heavily insulated penguins stretch out

so their naked feet can cool in the breeze.

Their gigantic neighbors use a different approach.

Wet sand cools the backs of these elephant seals

and also acts as a sunscreen.

The chicks, in their downy coats that have kept them warm all winter,

are in even greater danger of overheating.

It will be two months before they can swim properly,

but a dip in the shallow river brings a little relief.

There is, however, another way to cool the blood.

This murky pool has become a penguin spa.

It's a great way to cool the feet, but there is no reason to stop there.

You can indulge yourself with the full treatment.

Mud, glorious mud!

For the fully feathered adults,

there's a cleaner, more invigorating option.

The bracing waters of the Southern Ocean.

The 100-mile long island of South Georgia

lies on the northern fringe of Antarctica.

Ice-free all year, its rich coastal waters

make it a popular breeding destination for all beach lovers.

In summer, 95% of the world's population of Antarctic fur seals come here.

Packed tightly together,

they form one of the densest gatherings of marine mammals on Earth.

The island's beaches are filling fast and will soon be crammed

with five million of these summer visitors.

Space is at a premium, as every female needs a dry patch of sand

the size of a beach towel for herself.

And for good reason.

Virtually all of them give birth within just 10 days.

It's crucial to establish a strong bond with your baby

in such a crowded colony.

The pups grow quickly on rich, high-fat milk.

After giving birth, the females are ready to mate,

so each male guards up to 15 of them in his small patch of beach.

A bull may only hold a territory for one season in his entire life.

So, when a challenger arrives, he will risk everything to retain it.

Their sharp teeth inflict terrible injuries.

Many bulls die from exhaustion after these fights.

In the heat of the battle, the pups are also in real danger.

The defeated bull makes his escape,

but the colony still suffers from the side-effects of the battle.

Many of the pups get lost in the violence and confusion.

This time, there is a happy ending.

As summer progresses,

even more of the Southern Ocean is gradually opening up.

The summer melt, as it moves south,

arrives first at the Antarctic Peninsula,

the most northern tip of the continent.

As the ice retreats, a dramatic 500-mile-long coastline

is revealed for the first time in seven months.

This new seascape is home to one of the most numerous mammals on the planet.

Crabeater seals,

over 15 million live here amongst the drifting ice floes.

They owe their existence here to living organisms so small

you might hardly notice them.

The underside of the sea-ice is stained by algae.

These microscopic plants

support the most important Antarctic creatures of all.

Krill.

They have been grazing on the algal layer throughout the winter.

As the ice melts, more of the algae are released into the water.

Both algae and krill flourish in the summer sun.

The krill collect the algae in the sieve-like basket

formed by the interlocking hairs between their front legs.

There are 300 million tons of krill in the Southern Ocean,

with a greater combined weight than that of any other animal on the planet.

Almost all the animals of the Antarctic depend on krill,

including its giants.

Humpback whales.

They drive the krill to the surface

and then strain it from the water with the baleen sieves in their mouths.

Humpbacks often feed in teams, so the overspill from one huge mouth

can be collected by another just behind.

The abundance of krill attracts other visitors

to the peninsula in the summer.

Antarctic minke whales.

Their pointed heads and short dorsal fins give them speed and endurance.

And they need both.

There are other whales here, too.

Killers!

This is an extended family of mothers and their young.

And a male with a huge dorsal fin almost two meters high.

A lone minke whale.

It's just what this group of killer whales are looking for.

Working as a team, as they have done for decades,

they fan out across the strait in search of their quarry.

And they've found it.

The minke races away, pursued by outriders on each flank.

Terrified, the minke heads for the shore.

It's so desperate to escape it almost beaches itself.

It makes a desperate break for freedom.

Two hours and 20 miles later,

the minke is still alive and swimming strongly.

It's only real defense is its endurance.

But the killers work as a team,

with fresh ones replacing the outriders in relays.

And as the minke tires, the battering and the biting begins.

Sea birds are attracted by the smell of fresh blood rising from the water.

The killers try to flip the minke over.

If they can manage to keep its blowhole underwater,

it will drown.

One forces the minke's whole body down below the surface.

And then, the final strike.

The team drag the minke under for the last time

and the hunters, finally, can feed.

As the summer advances, the most southerly stretches

of the Antarctic Ocean are released from the ice.

Adélie penguins have been feeding in the open ocean.

The most southerly of all penguins,

they're returning to the Antarctic continent

with stomachs full of krill.

The sea-ice has finally retreated all the way back to the beach,

so the walk back to the colony is as short as it will ever be,

crucial for the half million penguins here

who are hurrying to raise their chicks before the freeze returns.

Most of the pairs have two chicks to care for.

Each chick requires nearly 30 kilograms of food before it's fully grown.

Most of their catch is krill

and Adélie penguins consume a staggering

one and a half million tons of it a year.

There are no land-based predators in Antarctica.

The threat here comes from the skies.

A South Polar skua.

An unguarded chick is an easy catch.

Nothing can save the chick now.

But now the parents can focus all their attention on the second.

Only half of these chicks will survive to adulthood.

But there are thousands more parents with young in this huge colony.

Parents that cannot rest,

for their young must be fit and strong

if they're to survive the dangers that autumn will bring.

In summer, the frozen oceans melt

and the polar animals disperse to feed amongst the broken ice.

So, even finding them in this vast expanse of sea

and drifting ice floes wouldn't be easy.

In the Arctic, the aim was to get close to a polar bear family

and film them in this fast-melting world.

Firstly, the team had to use a ship capable of breaking through the pack ice

around the 2,000-mile-long coastline of Svalbard.

Producer Miles Barton and cameraman Ted Giffords

are checking out fjords known to be frequented by bears.

We've just seen a bear that was walking around

in front of a glacier over there.

We've just arrived, so this is kind of a test more than anything,

but we're going to go and see if we can film it.

We're seeing how smoothly we can make this operation work.

Stay on Channel Six. Can you give me directions to the bear, please?

The plan is that the team's stabilized aerial camera,

now fitted to the speedboat,

will give perfectly stable shots of the bear swimming.

Spin this around or we'll lose it.

The fellow's over here, yeah?

- Got him, yeah. - I can't get any tighter.

You shoot it?

Wahey!

- That's nice. - Nice sparkle, nice liquid look.

- Going to let him go. - Okay, cut.

After their initial success,

the weather takes a turn for the worse.

We're used to the Baja.

For five days, there are no more polar bears to be found.

The captain decides to take a break and parks up in the pack ice.

But after all that fruitless searching by the crew, a bear visits them.

A large and inquisitive adult male.

So, the team decides to follow him.

The open water between boat and bear

means the crew can safely film from surprisingly close range

without disturbing him.

That's nice. Oops.

The bear is so relaxed

he even begins to hunt right alongside them.

He's looking for a seal inside.

But he's just completely ignoring us.

Just hold it there. Just hold it there for a minute.

He's going to climb up. Ready?

That's a big bear.

That's pretty good, pretty good.

The closest we've been to a polar bear so far.

Despite this remarkably close encounter,

the team still wants to film a family of bears.

These female and two cubs to starboard side.

She's at two...

There's good news on the radio.

- Oh, there's a cub. - Yeah, I've seen the cubs.

They're looking straight at us. Look at that. That's amazing.

As the mother looks distinctly hungry,

they will need to keep at least 15 feet of open water between her and the boat.

Having a good look at us.

Oh, look at them, look at the cubs.

- Yeah.

Jason, just go when you need to.

Oh, here she comes. Bloody hell.

Mother bears are always desperate for food for their cubs,

so the crew could be the perfect supper.

She's getting in.

Oh, my God, she's going to go in the water there.

The 15-footgap was just enough.

That was amazing.

Hands are freezing.

- We have to go. - Okay.

Do you want to get close up to the cubs?

Still rolling. Yeah, that's cute.

She's going in the water, okay.

And water and then... Stay with the cubs.

Okay, the cubs for a nice splash.

Go on, cubs. Yeah! Hooray! Well done, well done.

Great stuff.

She looked like she wanted to get in the boat once or twice.

Sometimes it's quite shocking to actually look up from the monitor

and realize they're about 15 feet away from you.

But a lovely family group.

The boat-based camera has helped to get remarkably close shots

of the bear family.

But how would it cope in the more extreme conditions

of the Southern Ocean?

Another Frozen Planet team headed south.

The plan is to use the same camera system to film the hunting strategy

of the most spectacular marine predators in Antarctica.

Killer whales.

The team enlisted the help of scientists Bob Pitman and John Durban.

They had put satellite tags on the whales

and so could locate them for the camera team.

Doug Allan operates the camera rig from the wheelhouse,

while Doug Anderson films from the deck.

- Yeah, there. See it? - It just surfaced right with them.

Okay, there's a killer whale at 11 o'clock,

about 200 meters, heading towards those two seals on the floe.

- Good. - This could be really good.

At last, having tracked the group for several days,

the whales look as if they are about to hunt.

Yeah, they're going to go in for it.

There it goes!

Four whales here.

Um, two adult females, a juvenile and a big adult male.

Swimming in formation,

the killers create a wave to wash the seal off the floe.

It's all pretty intense.

Oh, another wave.

- Yes, we have... - Wave.

- Wow! - Yeah, he's in the water.

Having successfully filmed several hunts

with the boat-based cameras from above,

the team are keen to see what's happening underwater.

Only one way to find out!

Time to launch the dinghy.

Doug Anderson approaches the seal and the killers

with an underwater camera mounted on a pole.

For the first time, the team can see how the whales create the killer wave.

There it is.

The underwater camera also reveals

surprisingly cautious behavior by the whales.

They seem wary of being bitten by the much smaller seal.

And they even blow bubbles to confuse it.

They're so cautious with the seals.

You know, at the end of the day, the seal's got a big mouth full of teeth

and these whales just don't take risks.

Having dealt with the seal,

the whales turn their attention to the dinghy.

First, they get right up close for a better look at Doug.

Then, they line up to create the kind of wave

that washed the seal off the floe.

Oh!

For a moment, the crew get an uncomfortably close seal's eye view

of this remarkable hunting strategy.

Look at that, look.

See that, Bob? The juvies are making waves.

It's a great feeling being there, being so close to the behavior,

actually having the water coming into the boat.

From our point of view, you know,

it's all about trying to get the feeling of being with these whales,

and with these whales, there's no bother with that because they're so confident.

They just want to be all around you and checking you out.

I mean, I can't imagine that I'm going to have

another experience like this in my career, you know.

These come along rarely,

and you just feel happy and lucky when they do come.

You just don't get better days than that.