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David Attenborough: In winter,
at the top of the planet
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00:00:39,320 --> 00:00:41,960
lies an icy wilderness...
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00:00:43,040 --> 00:00:46,600
Not of land but of frozen water.
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00:00:48,120 --> 00:00:49,880
The arctic ocean.
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00:00:52,360 --> 00:00:56,120
Its surface forms
an almost solid platform
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00:00:56,240 --> 00:00:59,520
that is bigger than
the whole of the United States.
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00:01:04,760 --> 00:01:06,800
Its presence and condition
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00:01:06,920 --> 00:01:11,560
dominates the lives of
all the many and varied animals
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00:01:11,680 --> 00:01:13,520
that live both on it...
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00:01:14,600 --> 00:01:16,440
And beneath it.
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00:01:22,920 --> 00:01:25,720
In the coming months,
the sun's warmth
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00:01:25,840 --> 00:01:30,720
will melt much of it and expose
the rich waters beneath.
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00:01:32,920 --> 00:01:37,040
To survive here,
life must adapt to this world
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00:01:37,160 --> 00:01:40,840
that alternates
between ice and water.
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00:02:00,400 --> 00:02:03,120
After three months
of winter darkness,
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00:02:03,240 --> 00:02:07,640
the sun rises
across arctic nonnay.
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00:02:16,200 --> 00:02:18,760
A newly emerged
polar bear mother
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00:02:18,880 --> 00:02:21,000
encourages her cubs
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00:02:21,120 --> 00:02:25,840
to take their first
tentative steps on the sea ice.
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00:02:34,000 --> 00:02:37,520
Cubs will stay with
their mothers for two years,
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00:02:37,640 --> 00:02:40,960
learning the skills needed
to survive out here.
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00:02:44,200 --> 00:02:47,680
But thereafter,
they will be on their own.
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00:02:51,720 --> 00:02:54,000
Further out on the sea ice...
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00:02:55,760 --> 00:02:59,400
This young female bear,
less than six years old,
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00:02:59,520 --> 00:03:02,160
is already fully independent.
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00:03:06,760 --> 00:03:08,920
She's superbly adapted to life
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00:03:09,040 --> 00:03:11,120
on the frozen ocean,
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00:03:11,240 --> 00:03:15,160
protected from the cold
by thick, insulating fat
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00:03:15,280 --> 00:03:17,560
and a double layer of fur.
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00:03:24,600 --> 00:03:29,000
This time of year
is the best time for feeding.
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00:03:32,640 --> 00:03:35,600
The ringed seals
on which she depends
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00:03:35,720 --> 00:03:37,280
feed on fish,
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00:03:37,400 --> 00:03:40,280
and are swimming
40 metres beneath her.
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00:03:42,440 --> 00:03:44,720
But after ten minutes
down there,
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00:03:44,840 --> 00:03:47,800
they must return
to the few gaps in the ice
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00:03:47,920 --> 00:03:50,320
to take a breath and rest.
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00:03:54,600 --> 00:03:56,560
She has acute hearing
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00:03:56,680 --> 00:04:00,000
and one of the most sensitive
noses in nature.
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00:04:05,040 --> 00:04:07,800
She can detect a seal's lair
beneath two metres
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00:04:07,920 --> 00:04:09,640
of snow and ice.
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00:04:12,520 --> 00:04:14,640
Timing is everything.
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00:04:35,920 --> 00:04:39,240
Only one in ten attempts
is successful...
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00:04:40,280 --> 00:04:44,840
So for a young bear,
each meal is very important.
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00:04:46,480 --> 00:04:49,720
But a male has picked up
the scent of the kill.
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00:05:04,160 --> 00:05:07,360
Large males pose
a real threat...
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00:05:11,480 --> 00:05:15,120
And could inflict
fatal injuries in a fight.
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00:05:21,120 --> 00:05:23,120
But she stands her ground.
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00:05:36,200 --> 00:05:39,720
Remarkably, rather than fight...
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00:05:42,520 --> 00:05:44,640
They start to play.
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00:05:56,720 --> 00:05:57,720
And then,
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00:05:57,840 --> 00:06:01,320
they set off
to explore together.
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00:06:09,520 --> 00:06:12,360
Well fed and still young,
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00:06:12,480 --> 00:06:16,000
these two seem to be
forming a friendship.
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00:06:25,680 --> 00:06:28,000
She shows off
the swimming skills
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00:06:28,120 --> 00:06:32,760
that enable her to move with
ease between water and ice.
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00:06:56,320 --> 00:06:57,720
She's behind you!
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00:07:22,800 --> 00:07:25,080
Dancing on ice...
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00:07:26,920 --> 00:07:30,120
Apparently
just for the joy of it.
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00:07:50,640 --> 00:07:54,760
After three hours together,
they part company...
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00:07:58,440 --> 00:08:03,400
And return once again
to their solitary lives.
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00:08:16,360 --> 00:08:19,440
Polar bears thrive
at this time of year
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00:08:19,560 --> 00:08:24,560
thanks to the huge platform of
sea ice on which they can hunt.
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00:08:29,720 --> 00:08:31,440
The arctic ocean lies
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00:08:31,560 --> 00:08:33,560
across the top
of the northern hemisphere
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00:08:33,680 --> 00:08:35,440
and over
the north pole itself...
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00:08:37,240 --> 00:08:39,880
And is surrounded
by three continents -
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00:08:40,000 --> 00:08:43,800
Europe, North America and Asia.
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00:08:46,600 --> 00:08:49,160
In winter, the sea ice extends
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00:08:49,280 --> 00:08:53,000
across an area of
over five million square miles.
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00:08:59,480 --> 00:09:02,160
But off the coast
of arctic Russia,
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00:09:02,280 --> 00:09:05,440
a tiny pocket of water
has been kept open...
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00:09:14,400 --> 00:09:19,920
By the continuous stirring
of 30 trapped beluga whales.
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00:09:31,520 --> 00:09:36,520
These four-metre-long arctic
whales are superbly adapted
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00:09:36,640 --> 00:09:40,560
for hunting far beneath
the surface of the sea ice.
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00:09:46,280 --> 00:09:48,440
Nonetheless, being mammals,
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00:09:48,560 --> 00:09:50,960
they must return to the surface
to breathe
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00:09:51,080 --> 00:09:53,480
every 15 minutes or so.
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00:09:58,920 --> 00:10:02,640
But this cold spell
is exceptionally severe.
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00:10:04,080 --> 00:10:07,760
And there's not another
breathing hole within 20 miles.
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00:10:13,560 --> 00:10:17,040
Nearby fish and squid
disappeared long ago.
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00:10:18,600 --> 00:10:22,720
These emaciated whales
have been imprisoned by the ice
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00:10:22,840 --> 00:10:26,560
for five months,
and they're now starving.
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00:10:32,840 --> 00:10:35,320
Their only chance of escape
will come
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00:10:35,440 --> 00:10:37,480
when there is a change
in the season.
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00:10:45,760 --> 00:10:49,000
As spring finally reaches
the north of the planet,
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00:10:49,120 --> 00:10:52,760
air temperatures
creep above freezing.
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00:11:08,240 --> 00:11:12,400
The impenetrable ice ceiling
begins to fracture.
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00:11:15,320 --> 00:11:19,360
Small life-saving channels
open up...
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00:11:24,520 --> 00:11:27,040
Bringing freedom.
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00:11:30,960 --> 00:11:34,880
But spring is a dangerous time
for beluga.
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00:11:35,880 --> 00:11:39,160
As tides and currents
pull ice apart,
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00:11:39,280 --> 00:11:41,640
the beluga find themselves
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00:11:41,760 --> 00:11:44,080
in a labyrinth
of shifting ice floes
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00:11:44,200 --> 00:11:46,520
that could close
their breathing holes
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00:11:46,640 --> 00:11:49,200
at any point, and so drown them.
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00:12:01,400 --> 00:12:03,960
Using their sophisticated sonar,
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00:12:04,080 --> 00:12:06,920
they try to find a way through
the icy maze...
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00:12:20,440 --> 00:12:24,640
And eventually reach
a patch of open water.
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00:12:31,280 --> 00:12:33,800
They're not
the only whales here.
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00:12:40,640 --> 00:12:41,640
Nannhal,
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00:12:41,720 --> 00:12:43,440
the unicorns of the sea,
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00:12:43,560 --> 00:12:45,960
are closely related to beluga.
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00:12:52,520 --> 00:12:54,720
In a rarely seen encounter,
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00:12:54,840 --> 00:12:58,400
these two kinds of whales
appear to socialise.
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00:13:00,560 --> 00:13:03,360
Who knows what's going on
between them?
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00:13:13,080 --> 00:13:15,520
But soon, they set off together
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00:13:15,640 --> 00:13:18,640
through the shifting fields
of ice...
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00:13:27,320 --> 00:13:30,400
A journey
of up to 1,000 miles...
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00:13:34,640 --> 00:13:37,400
Before they reach
ice-free waters,
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00:13:37,520 --> 00:13:40,280
where they can rear their young.
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00:13:55,280 --> 00:13:58,040
As the spring sunshine
strengthens,
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00:13:58,160 --> 00:14:01,520
the broken pack ice
off the coast of Greenland
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00:14:01,640 --> 00:14:04,240
becomes a nursery.
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00:14:10,280 --> 00:14:12,040
A harp seal pup...
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Born just a week ago.
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00:14:18,400 --> 00:14:20,520
He has little fat.
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00:14:22,240 --> 00:14:23,280
His thick fur
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00:14:23,400 --> 00:14:26,680
is his only protection
from the arctic chill.
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00:14:29,760 --> 00:14:33,920
In between dozes, he waits
for his mother to return.
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00:14:42,840 --> 00:14:45,640
She has only one pup a year...
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00:14:51,720 --> 00:14:55,120
And will produce milk
for only 12 days,
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00:14:55,240 --> 00:14:58,960
one of the shortest
nursing periods in nature.
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00:15:02,800 --> 00:15:04,360
That is just long enough
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00:15:04,480 --> 00:15:07,680
for him to develop
a thick layer of blubber...
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00:15:09,000 --> 00:15:13,480
Thanks to his mother's milk,
which is 50% fat.
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00:15:18,680 --> 00:15:21,240
And his mother stays alongside
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00:15:21,360 --> 00:15:24,920
while he learns
an important survival skill
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00:15:25,040 --> 00:15:26,480
for any seal...
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00:15:40,120 --> 00:15:41,880
How to swim.
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00:15:44,040 --> 00:15:47,440
He may not be keen
to take the plunge.
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00:15:47,560 --> 00:15:52,280
The salt water is minus
two degrees celsius, after all.
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00:16:02,800 --> 00:16:05,800
Pups start with a doggy paddle.
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00:16:09,760 --> 00:16:12,560
Mum stays reassuringly close.
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00:16:25,120 --> 00:16:27,440
Still developing
his insulating blubber,
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00:16:27,560 --> 00:16:30,840
a pup is at risk of hypothermia,
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00:16:30,960 --> 00:16:32,760
so needs to rest
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00:16:32,880 --> 00:16:34,600
and warm up.
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00:16:40,120 --> 00:16:41,120
Each day,
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00:16:41,240 --> 00:16:44,120
he puts on another two kilos...
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00:16:50,080 --> 00:16:51,440
And practises swimming
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00:16:51,560 --> 00:16:53,760
for just a little longer.
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00:17:08,320 --> 00:17:12,080
Since birth,
this pup has tripled in weight,
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00:17:12,200 --> 00:17:16,480
and he's now at ease
in this curious other world.
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00:17:29,120 --> 00:17:31,600
12 days gone by.
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00:17:32,920 --> 00:17:36,200
A mother's work is done.
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00:17:45,280 --> 00:17:49,840
In producing milk, she's lost
a third of her body weight.
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00:17:53,720 --> 00:17:57,600
Now she must return
to her feeding grounds.
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00:18:23,880 --> 00:18:27,040
She will never see
her pup again.
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00:18:43,320 --> 00:18:47,520
The next four weeks
he spends alone,
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00:18:47,640 --> 00:18:50,240
sticking close
to the ice platform...
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00:18:52,920 --> 00:18:56,280
Surviving on his fat reserves
152
00:18:56,400 --> 00:19:00,440
as his downy fleece is replaced
by a sleek coat
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00:19:00,560 --> 00:19:02,520
more suited to swimming.
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00:19:09,280 --> 00:19:11,200
But temperatures
in the arctic are now
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00:19:11,320 --> 00:19:13,240
rising faster
than ever before...
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00:19:16,200 --> 00:19:19,720
Creating storms
that break up the ice floes
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00:19:19,840 --> 00:19:22,160
earlier each spring.
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00:19:31,880 --> 00:19:35,720
Harp seal pups are being
tipped into freezing waters
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00:19:35,840 --> 00:19:40,000
before they're ready to endure
long periods at sea.
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00:19:49,760 --> 00:19:52,800
In some pupping areas,
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00:19:52,920 --> 00:19:55,280
almost none survive.
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00:20:20,240 --> 00:20:22,400
As spring turns to summer,
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00:20:22,520 --> 00:20:27,120
life on the sea ice
suddenly begins to proliferate.
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00:20:29,840 --> 00:20:32,080
The daylight increases,
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00:20:32,200 --> 00:20:34,360
and algae that had
remained dormant
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00:20:34,480 --> 00:20:36,960
within the ice all winter
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00:20:37,080 --> 00:20:38,960
begin to bloom.
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00:20:45,240 --> 00:20:48,080
This upside-down Meadow
is now cropped
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00:20:48,200 --> 00:20:49,960
by plankton.
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00:21:06,360 --> 00:21:09,160
For a little skeleton shrimp
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00:21:09,280 --> 00:21:12,920
living at the bottom
of a towering forest of kelp,
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00:21:13,040 --> 00:21:15,600
the best way to get
a share of the food...
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00:21:16,760 --> 00:21:18,560
Is to climb.
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00:21:22,800 --> 00:21:24,880
If you're only
two centimetres long...
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00:21:26,160 --> 00:21:28,840
This is like
scaling a skyscraper.
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00:21:31,640 --> 00:21:35,080
And yet it's not alone.
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00:21:37,080 --> 00:21:39,280
Hundreds of fellow shrimps
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00:21:39,400 --> 00:21:42,200
are attempting the same ascent.
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00:21:47,760 --> 00:21:48,960
A new mother
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00:21:49,080 --> 00:21:51,520
has parked her brood halfway up.
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00:21:52,680 --> 00:21:56,400
And she's not about to give way.
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00:22:09,680 --> 00:22:13,960
This one is
a determined commuter.
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00:22:14,080 --> 00:22:16,920
But the mother's drive
to protect her young
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00:22:17,040 --> 00:22:20,360
is now causing a trafficjam.
185
00:22:28,000 --> 00:22:29,440
At last...
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00:22:29,560 --> 00:22:32,600
Many have made it
to the topmost branches
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00:22:32,720 --> 00:22:34,920
of this underwater forest.
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00:22:37,280 --> 00:22:40,160
And it's been
well worth the effort.
189
00:22:42,200 --> 00:22:43,880
The prize...
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00:22:44,000 --> 00:22:45,560
Is a plankton feast...
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00:22:50,200 --> 00:22:53,000
Raining down from above.
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00:22:58,160 --> 00:23:02,120
By midsummer,
arctic waters are filled
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00:23:02,240 --> 00:23:03,280
with food...
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00:23:14,560 --> 00:23:19,080
Making them into one
of the richest of all oceans...
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00:23:23,320 --> 00:23:27,200
Feeding billions
of microscopic mouths,
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00:23:27,320 --> 00:23:28,560
as well as...
197
00:23:29,600 --> 00:23:31,880
The biggest mouth
on the planet...
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00:23:38,480 --> 00:23:40,360
The bowhead whale.
199
00:23:43,680 --> 00:23:46,560
Its four-metre-long
baleen plates
200
00:23:46,680 --> 00:23:48,840
enable it to sieve out
201
00:23:48,960 --> 00:23:51,840
up to six tonnes of plankton
a day.
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00:23:54,040 --> 00:24:00,200
And it grows swiftly into
an 18-metre 100-tonne giant.
203
00:24:06,840 --> 00:24:10,160
In summer,
the bowheads are so well fed
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00:24:10,280 --> 00:24:13,040
they head for
an annual get-together.
205
00:24:24,800 --> 00:24:27,280
After a year of wear and tear,
206
00:24:27,400 --> 00:24:30,760
their skin needs reconditioning.
207
00:24:37,120 --> 00:24:40,160
This is a whale health spa.
208
00:24:49,520 --> 00:24:54,880
Rocks and sand in the shallows
are used like pumice stones
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00:24:55,000 --> 00:24:58,600
with which to rub off
dead skin and parasites.
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00:25:03,440 --> 00:25:06,880
Such places can become
very popular.
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00:25:13,960 --> 00:25:16,320
This bay,
off the coast of Russia,
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00:25:16,440 --> 00:25:18,520
attracts an immense gathering
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00:25:18,640 --> 00:25:21,000
of over 50 bowheads.
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00:25:26,920 --> 00:25:30,200
They are the longest-lived
of all mammals.
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00:25:38,080 --> 00:25:41,280
Some are 200 years old
216
00:25:41,400 --> 00:25:44,480
and have been coming here
for many decades.
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00:25:47,880 --> 00:25:51,600
Suddenly,
their peace is shattered.
218
00:25:55,880 --> 00:25:59,240
Killer whales have arrived
from the south.
219
00:26:02,320 --> 00:26:03,800
Nine metres long,
220
00:26:03,920 --> 00:26:06,000
weighing nine tonnes...
221
00:26:07,400 --> 00:26:10,480
And renowned for their
exceptional intelligence...
222
00:26:12,040 --> 00:26:15,840
This particular pack
specialises in hunting
223
00:26:15,960 --> 00:26:17,880
bowhead whales.
224
00:26:29,320 --> 00:26:32,240
The bowheads retreat
into the shallows...
225
00:26:33,720 --> 00:26:35,800
Where it will be harder
226
00:26:35,920 --> 00:26:38,960
for killer whales
to launch an attack.
227
00:26:43,680 --> 00:26:47,520
But the killers can swim
much faster than the bowheads.
228
00:26:54,920 --> 00:26:57,920
The group tries to close ranks.
229
00:27:02,800 --> 00:27:05,640
But the killers attempt to
separate them.
230
00:27:15,160 --> 00:27:18,760
They look for individual signs
of weakness.
231
00:27:30,800 --> 00:27:33,640
In the shallows,
the bowheads lash out...
232
00:27:35,760 --> 00:27:38,720
With their
seven-metre-wide tails.
233
00:27:53,440 --> 00:27:56,920
But in the confusion,
some run aground.
234
00:28:10,920 --> 00:28:13,640
Others try to reach
deeper water.
235
00:28:16,480 --> 00:28:19,760
This youngster,
half the size of an adult,
236
00:28:19,880 --> 00:28:21,760
is extremely vulnerable.
237
00:28:31,640 --> 00:28:33,160
The killer whales
238
00:28:33,280 --> 00:28:37,120
take turns
to ram into its sides...
239
00:28:37,240 --> 00:28:42,000
Cracking its ribs so that
it struggles to breathe.
240
00:29:07,320 --> 00:29:12,760
Then they push the youngster
down until, finally...
241
00:29:13,800 --> 00:29:15,720
It drowns.
242
00:29:22,760 --> 00:29:24,680
The battle is over.
243
00:29:26,480 --> 00:29:28,880
It lasted an hour.
244
00:29:30,480 --> 00:29:34,840
Yet now the killer whales eat
only one part of their prey...
245
00:29:36,480 --> 00:29:39,280
The young bowhead's
soft, fatty tongue.
246
00:29:53,840 --> 00:29:56,480
Today, more and more bowheads
247
00:29:56,600 --> 00:29:59,760
are falling prey
to killer whales,
248
00:29:59,880 --> 00:30:01,080
as the warming climate
249
00:30:01,200 --> 00:30:03,760
causes the protective barrier
ofseaice
250
00:30:03,880 --> 00:30:06,280
to melt earlier each year.
251
00:30:24,760 --> 00:30:29,320
By midsummer, millions
of migratory sea birds,
252
00:30:29,440 --> 00:30:32,360
having flown thousands
of miles to get here,
253
00:30:32,480 --> 00:30:35,760
are feeding
in the arctic's rich waters.
254
00:30:40,320 --> 00:30:41,680
Over a million
255
00:30:41,800 --> 00:30:44,520
crested auklets,
no bigger than puffins,
256
00:30:44,640 --> 00:30:47,920
now descend on Alaska's
Saint Lawrence island
257
00:30:48,040 --> 00:30:50,840
and are preparing to breed.
258
00:30:55,440 --> 00:31:00,080
To win a mate, a male must try
to stand out from the crowd.
259
00:31:02,320 --> 00:31:05,640
And auditions are already
under way.
260
00:31:06,960 --> 00:31:11,080
Males and females, unusually,
look very similar,
261
00:31:11,200 --> 00:31:15,040
each adorned
with an Elvis-like crest.
262
00:31:15,160 --> 00:31:18,960
But it's the size of the crest
that matters.
263
00:31:23,000 --> 00:31:25,560
And this male's headgear
seems to be
264
00:31:25,680 --> 00:31:27,440
no more than adequate.
265
00:31:32,520 --> 00:31:35,600
A position on the ground
is also important.
266
00:31:40,640 --> 00:31:46,280
One large male
wants this particular perch...
267
00:31:55,720 --> 00:31:59,200
And having got it,
he breaks into song.
268
00:32:09,360 --> 00:32:13,440
He now releases
a potent tangerine scent
269
00:32:13,560 --> 00:32:14,960
from the back of his neck...
270
00:32:16,080 --> 00:32:18,840
And a mob of fans go wild.
271
00:32:24,720 --> 00:32:26,200
This male, however,
272
00:32:26,320 --> 00:32:28,360
seems to have nothing to offer.
273
00:32:32,960 --> 00:32:36,480
But a gaggle of groupies can be
a dangerous distraction.
274
00:32:41,360 --> 00:32:43,240
An arctic fox.
275
00:33:10,000 --> 00:33:11,720
It's found an egg.
276
00:33:15,200 --> 00:33:17,200
With the stage cleared,
277
00:33:17,320 --> 00:33:21,120
the highest perch
has become vacant.
278
00:33:41,760 --> 00:33:45,120
This is a moment to shine.
279
00:33:57,760 --> 00:34:00,480
His display
doesn't go unnoticed.
280
00:34:05,920 --> 00:34:09,840
And his tangerine perfume
attracts an admirer.
281
00:34:18,520 --> 00:34:20,880
And not just one.
282
00:34:25,120 --> 00:34:28,600
Now it's down to the females
to impress him.
283
00:34:32,320 --> 00:34:35,200
In auklet society, both sexes
284
00:34:35,320 --> 00:34:38,200
have a say when it comes
to choosing a mate.
285
00:34:49,520 --> 00:34:51,120
At the height of summer,
286
00:34:51,240 --> 00:34:54,040
with 24 hours of sunlight a day,
287
00:34:54,160 --> 00:34:57,640
over half the sea ice
melts away.
288
00:35:04,680 --> 00:35:06,880
The beaches of Svalbard
289
00:35:07,000 --> 00:35:09,920
provide safe places to haul out
290
00:35:10,040 --> 00:35:13,480
for one of the arctic's
special residents...
291
00:35:17,880 --> 00:35:19,680
Walruses.
292
00:35:22,440 --> 00:35:24,680
They forage for shellfish
293
00:35:24,800 --> 00:35:27,680
for up to 17 hours at a stretch.
294
00:35:32,240 --> 00:35:33,320
Now...
295
00:35:35,160 --> 00:35:37,240
It's time for a rest.
296
00:35:41,480 --> 00:35:46,000
Each adult male
weighs more than a tonne.
297
00:35:51,320 --> 00:35:53,000
And heaving oneself
over the sand...
298
00:35:55,200 --> 00:35:56,720
Without the support of water
299
00:35:56,840 --> 00:35:58,760
is very hard work.
300
00:36:05,240 --> 00:36:09,360
This male has a particular
sunbathing spot in mind...
301
00:36:13,120 --> 00:36:14,720
Right in the middle
302
00:36:14,840 --> 00:36:17,080
of the 50-strong huddle.
303
00:36:26,760 --> 00:36:28,560
A prod helps
in parting the crowd.
304
00:36:42,400 --> 00:36:44,320
Almost in.
305
00:36:54,600 --> 00:36:57,080
At last, he can settle down
for a snooze...
306
00:36:58,120 --> 00:36:59,240
Swaddled on all sides
307
00:36:59,360 --> 00:37:01,800
by the bodies of his neighbours.
308
00:37:05,200 --> 00:37:08,840
But it's not a peaceful spot.
309
00:37:18,440 --> 00:37:22,760
Sleep isn't easy
when a fidgety bedfellow
310
00:37:22,880 --> 00:37:24,800
decides that he has an itch
311
00:37:24,920 --> 00:37:27,080
that needs scratching.
312
00:37:28,320 --> 00:37:30,600
This is the time to moult,
313
00:37:30,720 --> 00:37:34,160
to get rid of one's old fur
with all its parasites,
314
00:37:34,280 --> 00:37:38,120
and expose the healthy
new coat beneath.
315
00:37:51,120 --> 00:37:53,640
These days,
Svalbard's summer temperatures
316
00:37:53,760 --> 00:37:57,160
can soar to 22 degrees celsius.
317
00:38:04,760 --> 00:38:07,920
Flushing red by bringing blood
close to the skin
318
00:38:08,040 --> 00:38:10,720
helps them to keep cool.
319
00:38:16,360 --> 00:38:19,800
But some overheating
is unavoidable...
320
00:38:21,960 --> 00:38:24,920
Especially for a big male.
321
00:38:34,760 --> 00:38:36,760
Enough is enough.
322
00:38:44,000 --> 00:38:46,040
Getting up here...
323
00:38:46,160 --> 00:38:47,400
Was a slog.
324
00:38:48,440 --> 00:38:52,480
But this male has found
a better way of getting down.
325
00:38:53,520 --> 00:38:56,240
Let gravity do the work.
326
00:39:27,800 --> 00:39:31,280
Now, that... is cool.
327
00:39:33,280 --> 00:39:35,200
Ahhh!
328
00:39:40,240 --> 00:39:42,760
Everyone is doing it.
329
00:39:42,880 --> 00:39:45,440
It saves both time and energy.
330
00:39:50,080 --> 00:39:53,760
But walruses will need
all the tricks they can find.
331
00:39:57,000 --> 00:39:59,880
The arctic is warming,
332
00:40:00,000 --> 00:40:03,640
and these cold-loving animals
are facing
333
00:40:03,760 --> 00:40:05,400
a precarious future.
334
00:40:16,120 --> 00:40:20,520
For millennia, the arctic ocean
has frozen over in the winter
335
00:40:20,640 --> 00:40:22,600
and then gradually melted
336
00:40:22,720 --> 00:40:25,560
throughout the spring
and summer.
337
00:40:27,000 --> 00:40:29,080
But in the last 40 years,
338
00:40:29,200 --> 00:40:34,280
the extent of the summer
sea ice has declined by 50%.
339
00:40:37,000 --> 00:40:40,200
Some predict
that it will be ice free
340
00:40:40,320 --> 00:40:42,840
as early as 2035.
341
00:40:47,000 --> 00:40:48,880
This profound change...
342
00:40:50,000 --> 00:40:51,800
Is already having an impact
343
00:40:51,920 --> 00:40:55,640
on the arctic ocean's
highly specialised wildlife.
344
00:41:01,560 --> 00:41:05,120
With less summer sea ice
from which to hunt seals,
345
00:41:05,240 --> 00:41:08,840
some polar bears are now
travelling up to 400 miles...
346
00:41:10,320 --> 00:41:13,560
Swimming continuously
for up to ten days
347
00:41:13,680 --> 00:41:15,400
in search of land.
348
00:41:22,760 --> 00:41:25,680
Wrangel island,
off arctic Russia...
349
00:41:26,920 --> 00:41:31,200
The only land
for almost 100 miles.
350
00:41:34,520 --> 00:41:38,800
Each summer, more and more
polar bears come ashore here.
351
00:41:46,800 --> 00:41:49,000
This newly arrived mother
352
00:41:49,120 --> 00:41:51,760
needs to find food
for her family...
353
00:41:57,600 --> 00:42:01,760
But knows not to approach
other adult bears.
354
00:42:05,080 --> 00:42:06,880
A full-grown male
355
00:42:07,000 --> 00:42:09,120
can kill and eat a cub,
356
00:42:09,240 --> 00:42:13,280
and will do so if other food
is in short supply.
357
00:42:15,320 --> 00:42:19,680
There are over 1,000 bears
on this one island.
358
00:42:23,160 --> 00:42:27,920
It's the greatest concentration
of polar bears on the planet.
359
00:42:34,360 --> 00:42:38,200
But there is food to be had
on these remote shores.
360
00:42:42,520 --> 00:42:43,960
A walrus colony...
361
00:42:46,200 --> 00:42:48,000
2,000 strong.
362
00:42:57,960 --> 00:43:00,600
The walruses panic.
363
00:43:13,600 --> 00:43:16,200
And there are casualties.
364
00:43:37,600 --> 00:43:40,680
Fights break out.
365
00:43:47,320 --> 00:43:51,200
This is no place
for a young family.
366
00:43:58,320 --> 00:44:01,200
The mother calls her cubs away.
367
00:44:17,800 --> 00:44:20,200
They must search elsewhere.
368
00:44:39,000 --> 00:44:43,440
Grass is a poor meal
for a growing cub...
369
00:44:44,800 --> 00:44:48,320
And starvation in summer
is a real threat.
370
00:44:59,520 --> 00:45:02,280
But this opportunity to feed...
371
00:45:03,320 --> 00:45:05,560
Is one she cannot
afford to ignore.
372
00:45:11,240 --> 00:45:13,280
It's time to gamble.
373
00:45:19,080 --> 00:45:20,600
Her cubs follow her.
374
00:45:22,840 --> 00:45:24,880
She urges them to stay back.
375
00:45:40,280 --> 00:45:42,680
The males are twice her size...
376
00:45:44,040 --> 00:45:46,560
But, preoccupied with feeding,
377
00:45:46,680 --> 00:45:48,880
they tolerate her presence.
378
00:45:54,400 --> 00:45:57,040
The distress calls
of her cubs, however...
379
00:45:58,360 --> 00:45:59,840
Attract unwelcome attention.
380
00:46:17,280 --> 00:46:20,680
Their mother rushes
to shield them with her body.
381
00:46:28,880 --> 00:46:32,800
But she seems torn
between guarding her family
382
00:46:32,920 --> 00:46:34,840
and feeding herself.
383
00:46:50,360 --> 00:46:52,720
Cubs left by themselves
384
00:46:52,840 --> 00:46:56,480
are easy prey
for a hungry male bear.
385
00:47:06,320 --> 00:47:10,920
But now her maternal instincts
take over.
386
00:47:33,520 --> 00:47:36,400
Faced with a mother's fury,
387
00:47:36,520 --> 00:47:38,920
the dominant male backs down.
388
00:48:02,240 --> 00:48:04,040
Having fought her way in...
389
00:48:05,920 --> 00:48:07,880
Her cubs can now feed
390
00:48:08,000 --> 00:48:10,360
for the first time in weeks.
391
00:48:19,680 --> 00:48:21,360
Polar bears were once
392
00:48:21,480 --> 00:48:23,040
the supreme hunters
393
00:48:23,160 --> 00:48:25,120
on the sea ice.
394
00:48:25,240 --> 00:48:26,680
Now, each summer,
395
00:48:26,800 --> 00:48:28,480
more and more of them
396
00:48:28,600 --> 00:48:30,000
have to come to land
397
00:48:30,120 --> 00:48:32,280
in search of food.
398
00:48:37,080 --> 00:48:40,680
Whether the ice bear
survives into the next century
399
00:48:40,800 --> 00:48:45,280
depends on what happens to
the sea ice on which they rely.
400
00:48:48,640 --> 00:48:53,400
As with all of the arctic
ocean's remarkable wildlife,
401
00:48:53,520 --> 00:48:56,920
it's how the climate changes
over the coming years
402
00:48:57,040 --> 00:48:59,800
that will determine
their future.
403
00:49:16,920 --> 00:49:19,560
In today's unpredictable
and changing arctic,
404
00:49:19,680 --> 00:49:23,520
filming its wildlife is
an ever-increasing challenge...
405
00:49:25,960 --> 00:49:28,360
None more so than trying
to capture the brief time
406
00:49:28,480 --> 00:49:30,800
that a mother harp seal spends
407
00:49:30,920 --> 00:49:33,120
preparing her pup
for life at sea.
408
00:49:37,520 --> 00:49:40,160
To find the seal's
pupping grounds,
409
00:49:40,280 --> 00:49:43,200
the crew have sailed
to a remote area of the arctic
410
00:49:43,320 --> 00:49:45,720
off the east coast of Greenland.
411
00:49:46,880 --> 00:49:48,920
But here, they quickly discover
412
00:49:49,040 --> 00:49:51,920
that its usually solid platform
of sea ice
413
00:49:52,040 --> 00:49:55,040
has broken up into
thousands of floes.
414
00:49:56,040 --> 00:49:58,720
It's a surprising sight
even for veteran captain
415
00:49:58,840 --> 00:50:00,680
bjorne kvernmo.
416
00:50:13,040 --> 00:50:15,720
And with the sea ice
so fractured,
417
00:50:15,840 --> 00:50:17,560
there's no sign of any wildlife.
418
00:50:18,840 --> 00:50:22,480
We've been at sea
for well over a week now.
419
00:50:22,600 --> 00:50:25,640
We still haven't filmed a thing.
420
00:50:26,840 --> 00:50:30,720
With mother and pup together
for just 12 days, it's a race
421
00:50:30,840 --> 00:50:32,880
to find the dense pack ice
422
00:50:33,000 --> 00:50:35,960
on which the breeding seals
give birth.
423
00:50:38,360 --> 00:50:42,040
The team head a further 100
miles up the Greenland coast,
424
00:50:42,160 --> 00:50:44,560
to an area no film crew
425
00:50:44,680 --> 00:50:46,400
has ventured into before.
426
00:50:48,600 --> 00:50:51,240
Their gamble pays off.
427
00:50:54,880 --> 00:50:57,840
Our first harp seal baby!
428
00:50:57,960 --> 00:51:01,320
From the smaller,
more manoeuvrable tender,
429
00:51:01,440 --> 00:51:03,600
cameraman Jamie mcpherson
430
00:51:03,720 --> 00:51:05,480
hopes to record
the precious time
431
00:51:05,600 --> 00:51:07,160
mother and pup spend together
432
00:51:07,280 --> 00:51:08,560
on the ice.
433
00:51:08,680 --> 00:51:09,736
I've been filming
434
00:51:09,760 --> 00:51:12,000
probably one of the cutest
animals in the world.
435
00:51:12,120 --> 00:51:13,280
And there was suckling,
436
00:51:13,400 --> 00:51:15,320
which is really cool,
because it's really funny,
437
00:51:15,440 --> 00:51:17,136
because the baby goes from
one nipple to the other nipple
438
00:51:17,160 --> 00:51:19,600
and just goes
backwards and fonnards.
439
00:51:24,400 --> 00:51:27,560
That's one of the
sweetest things I've ever seen!
440
00:51:27,680 --> 00:51:29,800
Utterly adorable!
441
00:51:31,240 --> 00:51:33,760
With mum now calling it
into the water,
442
00:51:33,880 --> 00:51:37,520
this pup may be ready
for its very first swim.
443
00:51:39,120 --> 00:51:41,760
It's the cue
for underwater cameraman
444
00:51:41,880 --> 00:51:43,240
Hugh Miller.
445
00:51:44,480 --> 00:51:45,960
We're going to try
something different
446
00:51:46,040 --> 00:51:47,880
and actually get into the water
with the seals.
447
00:51:47,960 --> 00:51:51,160
We're definitely
in new territory here.
448
00:51:53,280 --> 00:51:55,560
To film this rare moment
under water,
449
00:51:55,680 --> 00:51:57,680
Hugh will need to get
a lot closer
450
00:51:57,800 --> 00:51:59,440
without disturbing them.
451
00:52:01,600 --> 00:52:04,720
But with arctic waters
at minus two degrees celsius,
452
00:52:04,840 --> 00:52:08,840
even with a protective
thermal dry suit,
453
00:52:08,960 --> 00:52:13,600
Hugh only has an hour before he
risks developing hypothermia.
454
00:52:16,200 --> 00:52:20,720
It's now a matter of waiting
for the pup to take the plunge.
455
00:52:21,720 --> 00:52:24,160
The guys have now
beeninforabout"
456
00:52:27,280 --> 00:52:28,400
20 minutes.
457
00:52:29,880 --> 00:52:33,720
I can guarantee you
they'll be freezing cold.
458
00:52:35,000 --> 00:52:38,960
Hugh's body temperature
is getting dangerously low.
459
00:52:45,120 --> 00:52:47,120
Hugh: Conditions have been...
460
00:52:47,240 --> 00:52:49,040
Really hard.
461
00:52:49,160 --> 00:52:50,640
The cold just...
462
00:52:52,520 --> 00:52:54,200
It's been very, very difficult!
463
00:52:55,240 --> 00:52:56,840
Da vid: With less than
a week to go
464
00:52:56,960 --> 00:52:59,400
before this mother is likely
to leave her pup for ever,
465
00:52:59,520 --> 00:53:03,400
Jamie continues to capture
their intimate interactions...
466
00:53:08,880 --> 00:53:11,240
While Hugh is yet to film
a single shot.
467
00:53:13,120 --> 00:53:14,560
To make matters worse,
468
00:53:14,680 --> 00:53:19,480
temperatures fall to minus 30
degrees centigrade.
469
00:53:20,600 --> 00:53:22,560
And as the wind direction
changes,
470
00:53:22,680 --> 00:53:26,240
the floes are forced
closer together.
471
00:53:26,360 --> 00:53:28,880
Pack ice has just come in
from all around us.
472
00:53:29,000 --> 00:53:30,440
It could flip the boat,
473
00:53:30,560 --> 00:53:32,160
and that would be
the end of the shoot.
474
00:53:33,560 --> 00:53:36,120
Hemmed in by blocks
475
00:53:36,240 --> 00:53:38,520
weighing several tonnes,
the small skiffs
476
00:53:38,640 --> 00:53:40,560
are at risk of getting crushed.
477
00:53:41,680 --> 00:53:43,800
They radio for help.
478
00:53:43,920 --> 00:53:46,520
But as the mother ship
approaches, she shunts
479
00:53:46,640 --> 00:53:48,760
even more ice their way.
480
00:53:53,120 --> 00:53:55,680
So, we've got these big
chunks of ice either side of us
481
00:53:55,800 --> 00:53:58,120
and they've got to go
somewhere, so...
482
00:53:59,920 --> 00:54:02,880
With help three days away,
the crew
483
00:54:03,000 --> 00:54:05,760
can't afford any mistakes.
484
00:54:11,120 --> 00:54:14,320
In the Nick of time, a lifeline.
485
00:54:18,760 --> 00:54:20,320
Safely aboard!
486
00:54:21,320 --> 00:54:23,200
That was a bit full-on!
487
00:54:26,880 --> 00:54:30,120
By the next day,
the pack ice has drifted apart.
488
00:54:31,160 --> 00:54:33,840
And not a moment too soon.
489
00:54:43,280 --> 00:54:45,240
Rachel: Awww!
490
00:54:49,200 --> 00:54:51,920
Jamie: We just
saw it go for its first swim.
491
00:54:52,920 --> 00:54:53,920
It was amazing.
492
00:54:54,040 --> 00:54:57,280
It just sort of flops about on
the surface. It was very cool.
493
00:55:00,200 --> 00:55:04,480
With the pup finally in the
water, Hugh seizes his chance.
494
00:55:05,880 --> 00:55:09,520
But what will the pup make
of this curious sea creature?
495
00:55:14,320 --> 00:55:18,800
This pup is playing with -
playing with! - The camera.
496
00:55:18,920 --> 00:55:21,480
I can see Hugh's smile
from here.
497
00:55:23,240 --> 00:55:25,920
Hugh: Oh, lovely. Wow!
498
00:55:27,520 --> 00:55:29,160
That was great!
499
00:55:29,280 --> 00:55:31,520
- Yeah, we saw.
- That was great!
500
00:55:31,640 --> 00:55:33,360
Hugh: So nice.
501
00:55:36,080 --> 00:55:38,480
Just as Hugh gets his reward,
502
00:55:38,600 --> 00:55:41,760
the arctic conditions
take a turn for the worse.
503
00:55:43,240 --> 00:55:44,760
We've been getting
some amazing stuff,
504
00:55:44,880 --> 00:55:48,360
but now the wind's picked up,
so we're trying to get out.
505
00:55:50,560 --> 00:55:52,000
With a storm brewing,
506
00:55:52,120 --> 00:55:55,600
not even the mother ship
is safe among the ice floes.
507
00:55:55,720 --> 00:56:00,720
The crew have no choice
but to leave the seals behind.
508
00:56:08,160 --> 00:56:10,520
It would roll in by the storm?
509
00:56:12,560 --> 00:56:14,000
And they drown?
510
00:56:21,680 --> 00:56:25,880
Today, the combination
of reduced arctic sea ice
511
00:56:26,000 --> 00:56:27,640
and heavy storms
512
00:56:27,760 --> 00:56:31,080
is leading to more and more
tragedies like this.
513
00:56:33,840 --> 00:56:35,280
Unless this trend is reversed,
514
00:56:35,400 --> 00:56:39,040
the future for much of
the arctic's unique wildlife
515
00:56:39,160 --> 00:56:41,240
hangs in the balance.
36149
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