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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've 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 traveling 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 fowl. 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 go 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 the 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.

In land 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 big 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 owl's tiny neighbors the Lapland buntings.

Both parents feed their growing family continuously.

A mere ten 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 skewer. 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

chicks 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 over exert 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 the territory for one season in his

entire life. So when a challenger arrives, he will risk

everything to retain it. A bull

may only hold the territory for one season in his entire

life. 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. A bull

may only hold the territory for one season in his entire life.

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. Crab eater seals, over 15 million

live here amongst the drifting ice flows.

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.

Humpback whales.

Humpback whales. 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

they're male, with a huge dorsal fin almost two meters high.

Alone 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.

Humpback whales.

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. Its 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.

A daily 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 catches krill and a daily 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 skewer.

An unguarded chick is an easy catch.

Nothing can save the two penguins. One 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 the 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 2000 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 a 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.

All day on channel 6 can you give me directions to the

bear please? The plan is that the team's stabilised aerial

camera, now fitted to the speedboat, will give perfectly

stable shots of the bear swimming. Spin this around or we'll

lose our boat. There's a fellow over here yeah? Oh

yeah he's got him, he's got him. Can you shoot it?

Whee!

Look at the lights. Nice sparkle, nice liquid

look. I'm going to let him go. Okay cut.

After that initial success the weather takes a turn for the

worse. It's kind of really easy over here. 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, look.

The bear is so relaxed he even begins to hunt right

alongside them. He's looking for a seal inside. He's just

completely ignoring this. 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. Is these

females the two cubs to starboard side? 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. I want a good look at this. Oh, look at them, look at the cubs.

Jason, just go when you need to.

Oh, she's gone. Bloody hell. Other bears are always

desperate for food for their cubs so the crew could be the

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

with us. The 15-foot gap was just enough. Oh, that was

amazing.

Down to go. OK. Do you want to get close up to the cubs?

Yeah, that's cute. Just go in the water, OK. And then stay

with the cubs. OK, with the cubs for a nice splash.

Go on, cubs, yeah. Hey. 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 realise 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 Durbin. They could put satellite tags on the

whales and so could locate them for the camera team.

Doug Allen operates the camera rig from the wheelhouse,

while Doug Anderson films from the deck. Yeah, there, see

it? It just surfaced right with them. OK, there's a killer

whale at 11 o'clock, about 200 metres heading towards those

two seals on the floor. 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.

Four whales here. Two adult females, a juvenile and a big

adult male. Swimming in formation, the killers create a wave

to wash the seal off the flow. It's all pretty intense. Oh,

another wave. 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. There it

is. 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

behaviour 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. At the end of the

day, the seal's got a big mouth full of

teeth and these whales just don't take risks.

That'll do.

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 flow.

For a moment, the crew get an uncomfortably close

seal's eye view of this remarkable hunting strategy.

It's a great feeling being there. Being so close to the

behaviour. Actually having the water coming into the boat.

From our point of view, you know, it's all about trying to

get a 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.

you