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The oceans, seemingly limitless, | 0:00:29 | 0:00:32 | |
invoke in us a sense of awe | 0:00:32 | 0:00:34 | |
and wonder, and also sometimes fear. | 0:00:34 | 0:00:37 | |
They cover 70% of the surface of our planet, | 0:00:37 | 0:00:41 | |
and yet they are still the least explored. | 0:00:41 | 0:00:44 | |
Hidden beneath the waves, right beneath my feet, | 0:00:46 | 0:00:51 | |
there are creatures beyond our imagination. | 0:00:51 | 0:00:54 | |
With revolutionary technology, we can enter new worlds... | 0:01:09 | 0:01:13 | |
..and shine a light on behaviours in ways that were impossible | 0:01:19 | 0:01:22 | |
just a generation ago. | 0:01:22 | 0:01:25 | |
In this extended special, we celebrate | 0:01:32 | 0:01:35 | |
some of the highlights from the series. | 0:01:35 | 0:01:37 | |
We will journey across the globe... | 0:01:40 | 0:01:42 | |
..from the warm waters of the tropics... | 0:01:48 | 0:01:51 | |
..to the coldest seas around the poles... | 0:01:56 | 0:01:59 | |
..and down into the unexplored depths... | 0:02:01 | 0:02:04 | |
WHOOSHING | 0:02:04 | 0:02:07 | |
..to bring us a new understanding of life beneath the waves. | 0:02:09 | 0:02:13 | |
BIRDS SQUAWK | 0:02:13 | 0:02:14 | |
This is Blue Planet II. | 0:02:21 | 0:02:24 | |
The surface of the ocean conceals the many creatures that | 0:03:23 | 0:03:27 | |
live beneath. | 0:03:27 | 0:03:28 | |
But not all. | 0:03:40 | 0:03:42 | |
Bottlenose dolphins. | 0:03:45 | 0:03:48 | |
They are extremely intelligent. | 0:03:50 | 0:03:53 | |
And with this intelligence comes playfulness. | 0:04:03 | 0:04:06 | |
They surf... | 0:04:13 | 0:04:15 | |
..and as far as we can tell, they do so for the sheer joy of it. | 0:04:17 | 0:04:21 | |
But to properly appreciate their true character... | 0:04:50 | 0:04:52 | |
DOLPHINS SING | 0:04:52 | 0:04:54 | |
..you have to travel with them into THEIR world. | 0:04:54 | 0:04:58 | |
A pod of bottlenose dolphins is visiting a | 0:05:10 | 0:05:14 | |
coral reef in the Red Sea. | 0:05:14 | 0:05:16 | |
For the youngsters, there are things to be learned here. | 0:05:19 | 0:05:23 | |
DOLPHINS SING | 0:05:23 | 0:05:25 | |
The adults lead a calf to a particular bush-like coral | 0:05:31 | 0:05:35 | |
called a gorgonian. | 0:05:35 | 0:05:39 | |
And here the adults behave rather strangely. | 0:05:46 | 0:05:49 | |
They deliberately rub themselves through the fronds. | 0:05:56 | 0:05:59 | |
Their calf seems reluctant to do so. | 0:06:13 | 0:06:16 | |
By watching his elders, | 0:06:28 | 0:06:30 | |
he may be realising that this is something he ought to do. | 0:06:30 | 0:06:34 | |
Gorgonian fronds, in fact, are covered with a mucus | 0:06:41 | 0:06:44 | |
that can have anti-inflammatory and anti-microbial properties. | 0:06:44 | 0:06:49 | |
So maybe the adult dolphins are doing this to protect | 0:06:54 | 0:06:57 | |
themselves from infection. | 0:06:57 | 0:06:59 | |
The dolphins' intimate knowledge of the reef is spurring us | 0:07:09 | 0:07:14 | |
to search for new medicines here, too. | 0:07:14 | 0:07:17 | |
Tropical coral reefs occupy only a tenth of 1% of the ocean floor. | 0:07:27 | 0:07:32 | |
But their shallow warm waters and stable year-round conditions | 0:07:35 | 0:07:40 | |
support some of the most crowded and varied communities | 0:07:40 | 0:07:44 | |
to be found anywhere in the oceans. | 0:07:44 | 0:07:46 | |
And there are new discoveries to be made on every one of them. | 0:07:49 | 0:07:54 | |
One creature on Australia's Great Barrier Reef | 0:08:14 | 0:08:17 | |
is challenging our understanding of fish intelligence. | 0:08:17 | 0:08:22 | |
A tusk fish, and you can see why it gets its name. | 0:08:23 | 0:08:28 | |
He does something few would have believed a fish could do. | 0:08:32 | 0:08:37 | |
Every morning, he travels to the edge of the reef. | 0:08:43 | 0:08:47 | |
He's searching for something special to eat amongst the coral rubble | 0:09:02 | 0:09:05 | |
and sand. | 0:09:05 | 0:09:07 | |
Here's one. | 0:09:10 | 0:09:12 | |
A small clam. | 0:09:14 | 0:09:15 | |
But how to crack it open and get to the meat? | 0:09:22 | 0:09:26 | |
He takes it all the way back to his special kitchen... | 0:09:37 | 0:09:41 | |
..a bowl-shaped coral that has a particular bump on the inside | 0:09:50 | 0:09:55 | |
that he always uses. | 0:09:55 | 0:09:58 | |
It's not easy | 0:10:15 | 0:10:17 | |
if you have no hands. | 0:10:17 | 0:10:19 | |
Oops! | 0:10:26 | 0:10:27 | |
There it goes again. | 0:10:27 | 0:10:30 | |
But he's got great determination... | 0:10:34 | 0:10:38 | |
..and surprising accuracy. | 0:10:43 | 0:10:45 | |
At last. | 0:11:05 | 0:11:06 | |
So here is a fish that uses tools. | 0:11:09 | 0:11:12 | |
Some fish are much cleverer than you might suppose. | 0:11:14 | 0:11:18 | |
The density of the animals on tropical reefs makes | 0:11:35 | 0:11:39 | |
competition inevitable and extreme... | 0:11:39 | 0:11:42 | |
..not only for those that live within the reefs, | 0:11:43 | 0:11:46 | |
but for the birds that fly above them. | 0:11:46 | 0:11:49 | |
BIRDS SQUAWK | 0:11:49 | 0:11:53 | |
During the dry season, over half a million terns crowd onto | 0:11:53 | 0:11:58 | |
this remote atoll in the Indian Ocean. | 0:11:58 | 0:12:01 | |
Their chicks are still in their dark juvenile plumage. | 0:12:08 | 0:12:13 | |
Those just starting to learn to fly use the | 0:12:28 | 0:12:31 | |
shallow lagoon that occupies the centre of the atoll | 0:12:31 | 0:12:35 | |
as their training ground. | 0:12:35 | 0:12:37 | |
It's difficult for some of them to stay aloft for long. | 0:12:39 | 0:12:42 | |
Giant trevallies! | 0:13:07 | 0:13:09 | |
Usually, they are solitary hunters, | 0:13:21 | 0:13:25 | |
but about 50 of them have come here from neighbouring reefs, | 0:13:25 | 0:13:29 | |
attracted by this abundance of potential prey. | 0:13:29 | 0:13:32 | |
The fledglings stay out of the water if they can. | 0:13:40 | 0:13:44 | |
They even drink on the wing. | 0:13:45 | 0:13:48 | |
If the trevally are to catch one now, they have to up their game. | 0:14:05 | 0:14:11 | |
So there is a fish here that, amazingly, has a brain | 0:14:20 | 0:14:24 | |
capable of calculating the air speed, | 0:14:24 | 0:14:28 | |
altitude and trajectory of a bird. | 0:14:28 | 0:14:31 | |
The time comes when every fledgling has | 0:15:02 | 0:15:05 | |
to take to the air and collect food for itself. | 0:15:05 | 0:15:08 | |
Their parents lead them to the training grounds. | 0:15:32 | 0:15:35 | |
BIRDS SQUAWK | 0:16:03 | 0:16:05 | |
If they are to survive, they must learn quickly. | 0:17:10 | 0:17:15 | |
After a month of practising over the lagoon, the youngsters start | 0:17:23 | 0:17:27 | |
to leave and take their chances out over the open sea. | 0:17:27 | 0:17:31 | |
The oceans hold 97% of all the water in the world. | 0:17:39 | 0:17:44 | |
As the sun warms their surface, water evaporates. | 0:17:47 | 0:17:50 | |
The vapour rises into the sky | 0:17:51 | 0:17:53 | |
until it cools and condenses into towering clouds. | 0:17:53 | 0:17:58 | |
THUNDER CRASHES | 0:17:58 | 0:18:00 | |
And they generate huge storms. | 0:18:00 | 0:18:03 | |
The spin of the Earth deflects these storms, north and south, | 0:18:07 | 0:18:11 | |
into cooler latitudes. | 0:18:11 | 0:18:13 | |
As they travel across the sea, | 0:18:22 | 0:18:24 | |
storm-driven winds create huge swells. | 0:18:24 | 0:18:28 | |
When the swells reach shallower water, | 0:18:32 | 0:18:34 | |
they rise into gigantic waves. | 0:18:34 | 0:18:37 | |
In its lifetime, a large storm can release | 0:18:55 | 0:18:58 | |
energy that is the equivalent of 10,000 nuclear bombs. | 0:18:58 | 0:19:03 | |
These are the seasonal seas. | 0:19:28 | 0:19:31 | |
And when they warm in spring, they can suddenly explode with life. | 0:19:33 | 0:19:38 | |
Mobula rays have gathered in Mexico's | 0:19:53 | 0:19:56 | |
Sea of Cortez in vast numbers. | 0:19:56 | 0:19:58 | |
Why do they leap? | 0:20:06 | 0:20:08 | |
Is it to tell others that they're here? | 0:20:11 | 0:20:13 | |
No-one knows. | 0:20:16 | 0:20:18 | |
They feed mostly at night, | 0:20:21 | 0:20:23 | |
for that is when vast swarms of plankton rise from the depths. | 0:20:23 | 0:20:28 | |
The disturbance in the water stimulates | 0:20:34 | 0:20:37 | |
many of the planktonic creatures to luminesce. | 0:20:37 | 0:20:41 | |
Only now do we have the technology to | 0:20:43 | 0:20:45 | |
record their faint glow. | 0:20:45 | 0:20:47 | |
The feasting rays swim through them, | 0:20:56 | 0:20:59 | |
creating an extraordinary ballet of life and death. | 0:20:59 | 0:21:03 | |
The richness of these waters is based on microscopic plants, | 0:21:51 | 0:21:56 | |
phytoplankton, which bloom on | 0:21:56 | 0:21:58 | |
such a massive scale, they benefit us all. | 0:21:58 | 0:22:02 | |
They, together with seaweeds and seagrasses, | 0:22:05 | 0:22:09 | |
produce as much oxygen as | 0:22:09 | 0:22:11 | |
all the forests and grassy plains on land. | 0:22:11 | 0:22:14 | |
In the shallow waters of the seasonal seas | 0:22:26 | 0:22:29 | |
lie great undersea forests. | 0:22:29 | 0:22:31 | |
Giant kelp towers 60 metres high. | 0:22:40 | 0:22:44 | |
These enchanted forests are crowded with life. | 0:22:55 | 0:23:00 | |
Creatures jostle for space and food. | 0:23:03 | 0:23:06 | |
In the fiercely competitive kelp forests off Southern Africa, | 0:23:15 | 0:23:19 | |
survival can demand great ingenuity. | 0:23:19 | 0:23:22 | |
A common octopus. | 0:23:25 | 0:23:27 | |
She is waiting for prey to pass by. | 0:23:30 | 0:23:33 | |
A crab will do. | 0:23:38 | 0:23:40 | |
The octopus sets off in pursuit... | 0:23:46 | 0:23:49 | |
..and then lurks with the patience of an ambush hunter. | 0:24:04 | 0:24:10 | |
But the octopus shares the Cape waters with a great | 0:24:36 | 0:24:39 | |
concentration of other predators. | 0:24:39 | 0:24:42 | |
Fur seals... | 0:24:49 | 0:24:51 | |
..and sharks. | 0:24:53 | 0:24:55 | |
They all eat octopus... | 0:24:58 | 0:25:00 | |
..if they can find one. | 0:25:00 | 0:25:03 | |
And pyjama sharks are experts... | 0:25:11 | 0:25:14 | |
..at hunting in the undergrowth. | 0:25:17 | 0:25:19 | |
Time to disappear. | 0:25:28 | 0:25:30 | |
But these tough-skinned little sharks are | 0:25:36 | 0:25:39 | |
small enough to reach deep into crevices. | 0:25:39 | 0:25:42 | |
But the octopus is far from finished. | 0:26:01 | 0:26:04 | |
She slips her tentacles into the shark's gills. | 0:26:07 | 0:26:10 | |
That prevents the shark from breathing. | 0:26:12 | 0:26:14 | |
So the shark HAS to let go. | 0:26:19 | 0:26:21 | |
When caught out in the open and vulnerable, | 0:26:33 | 0:26:36 | |
this octopus does something truly extraordinary... | 0:26:36 | 0:26:39 | |
..and never recorded before. | 0:26:41 | 0:26:43 | |
She disguises herself... | 0:26:54 | 0:26:56 | |
..with a protective armour of shells. | 0:26:59 | 0:27:01 | |
She's hiding in plain sight. | 0:27:07 | 0:27:10 | |
The shark can sense its prey. | 0:27:21 | 0:27:24 | |
But the shells confuse it. | 0:27:38 | 0:27:40 | |
In a forest full of hungry mouths, | 0:27:46 | 0:27:49 | |
superior wits allow this octopus to stay alive. | 0:27:49 | 0:27:53 | |
In the underwater forests off northern Japan... | 0:28:06 | 0:28:09 | |
..the residents of this sunken wreck | 0:28:14 | 0:28:17 | |
are waiting for the summer temperatures to reach | 0:28:17 | 0:28:19 | |
16 degrees Celsius. | 0:28:19 | 0:28:21 | |
That, for some, is the time for mating. | 0:28:25 | 0:28:28 | |
A kind of giant wrasse called a kobudai. | 0:28:42 | 0:28:46 | |
This is a male... | 0:28:53 | 0:28:54 | |
..and in female terms, | 0:29:00 | 0:29:02 | |
he's particularly handsome. | 0:29:02 | 0:29:04 | |
He's a metre long and weighs 15 kilos... | 0:29:11 | 0:29:15 | |
..much larger than the diminutive female. | 0:29:18 | 0:29:22 | |
And he is ready to breed. | 0:29:25 | 0:29:28 | |
He attempts to mate with her, | 0:29:31 | 0:29:33 | |
and with any of the other dozen or so females | 0:29:33 | 0:29:37 | |
that live in his territory... | 0:29:37 | 0:29:39 | |
..whenever he gets the chance. | 0:29:39 | 0:29:42 | |
But females from around ten years old take | 0:29:56 | 0:29:59 | |
little notice of his advances. | 0:29:59 | 0:30:02 | |
This is because, when any large female reaches a critical | 0:30:30 | 0:30:33 | |
body size, she can begin a dramatic transformation. | 0:30:33 | 0:30:38 | |
Over just a few months, | 0:30:56 | 0:30:58 | |
particular enzymes inside her body cease to work... | 0:30:58 | 0:31:01 | |
..and male hormones start to circulate. | 0:31:04 | 0:31:07 | |
As time passes, her head expands | 0:31:12 | 0:31:16 | |
and her chin gets longer. | 0:31:16 | 0:31:19 | |
A "she" has changed into a "he". | 0:31:22 | 0:31:25 | |
And with this comes a change in temperament. | 0:31:35 | 0:31:38 | |
The old male who ruled all the females here... | 0:31:45 | 0:31:47 | |
..is challenged to a face-off. | 0:31:49 | 0:31:52 | |
The more bulbous the head, the more it intimidates an opponent. | 0:31:59 | 0:32:04 | |
The territory has a new ruler. | 0:32:31 | 0:32:34 | |
Only the largest females transform themselves in this way. | 0:32:46 | 0:32:50 | |
But the change enables them to have more mates, | 0:32:55 | 0:32:59 | |
so they will have many more offspring carrying their genes. | 0:32:59 | 0:33:04 | |
But a new male can't afford to be complacent. | 0:33:10 | 0:33:13 | |
Inside the body of every kobudai female | 0:33:15 | 0:33:19 | |
there is a new male-in-waiting. | 0:33:19 | 0:33:22 | |
At the height of summer, there is an | 0:33:40 | 0:33:42 | |
explosion in the population of another forest resident. | 0:33:42 | 0:33:46 | |
But this one is out to attack the very forest itself. | 0:33:48 | 0:33:52 | |
Off the Pacific coast of North America, | 0:33:56 | 0:33:58 | |
armies of sea urchins cut through the kelp fronds. | 0:33:58 | 0:34:02 | |
Protected by a coat of spines, | 0:34:10 | 0:34:12 | |
with their mouths full of razor teeth, they fell the great stalks. | 0:34:12 | 0:34:17 | |
Behind them, they leave a wasteland, | 0:34:36 | 0:34:38 | |
known as an urchin barren. | 0:34:38 | 0:34:41 | |
But help is at hand. | 0:34:56 | 0:34:58 | |
Sea otters. | 0:35:07 | 0:35:09 | |
All other kinds of otters spend much of | 0:35:13 | 0:35:15 | |
their lives on land, but sea otters rarely | 0:35:15 | 0:35:19 | |
leave the water. | 0:35:19 | 0:35:20 | |
At first, a newly born pup is not a very good swimmer, | 0:35:24 | 0:35:29 | |
so its mother spends hours grooming its fur to make it buoyant. | 0:35:29 | 0:35:33 | |
But to provide her youngster with milk and keep herself warm, | 0:35:40 | 0:35:44 | |
she must eat up to 30% of her body weight every day. | 0:35:44 | 0:35:48 | |
She does that by eating shellfish. | 0:36:08 | 0:36:11 | |
And urchins are among a sea otter's favourite delicacies. | 0:36:16 | 0:36:21 | |
In the past, sea otters were hunted so intensively | 0:36:39 | 0:36:43 | |
for their fur that they came close to extinction. | 0:36:43 | 0:36:46 | |
With them gone, many kelp forests were replaced with urchin barrens. | 0:36:52 | 0:36:58 | |
Today, sea otters are protected. | 0:37:08 | 0:37:10 | |
And as their numbers slowly return, | 0:37:13 | 0:37:16 | |
many of the kelp forests are recovering, too. | 0:37:16 | 0:37:19 | |
Now, in some remote places, sea otters are so numerous, | 0:37:35 | 0:37:39 | |
they assemble in huge rafts... | 0:37:39 | 0:37:42 | |
..something that hasn't been seen for over a century. | 0:37:47 | 0:37:51 | |
Coasts are the most swiftly changing of all ocean habitats... | 0:38:24 | 0:38:29 | |
..because of the tides. | 0:38:36 | 0:38:38 | |
Tides are created as the moon's gravity pulls at the sea. | 0:38:50 | 0:38:55 | |
As the moon circles our planet, the seas rise and fall... | 0:39:05 | 0:39:10 | |
..typically twice a day... | 0:39:12 | 0:39:14 | |
..creating the most constantly dynamic landscapes on Earth. | 0:39:16 | 0:39:20 | |
Nowhere else do sea-living creatures face such changeable conditions... | 0:39:30 | 0:39:35 | |
..with the daily risk of drying out and being scorched by the sun. | 0:39:39 | 0:39:44 | |
Where the tide retreats across a rocky shore, | 0:39:50 | 0:39:53 | |
it can leave behind a temporary oasis. | 0:39:53 | 0:39:56 | |
A rock pool. | 0:40:04 | 0:40:06 | |
Seemingly, it's a haven of calm. | 0:40:16 | 0:40:19 | |
But not for long. | 0:40:22 | 0:40:24 | |
Turning minutes into seconds reveals | 0:40:26 | 0:40:28 | |
unexpected dramas. | 0:40:28 | 0:40:30 | |
In rock pools, grazers, | 0:40:44 | 0:40:46 | |
scavengers and filter-feeders must all make the most of | 0:40:46 | 0:40:49 | |
the few short hours before the tide returns. | 0:40:49 | 0:40:53 | |
Anemones gulp down anything they can reach... | 0:41:10 | 0:41:14 | |
..though some meals are harder to digest than others. | 0:41:16 | 0:41:19 | |
LOW RUMBLING | 0:41:19 | 0:41:21 | |
These magical worlds soon become battlegrounds. | 0:41:28 | 0:41:32 | |
A deadly predator with five arms and, on the underside, a mouth. | 0:41:35 | 0:41:41 | |
The ochre starfish. | 0:41:44 | 0:41:47 | |
And it's in search of limpets. | 0:41:51 | 0:41:54 | |
For some, there is no escape. | 0:42:13 | 0:42:16 | |
It engulfs them. | 0:42:16 | 0:42:18 | |
But other limpets have a secret defence. | 0:42:26 | 0:42:29 | |
They deploy a slippery shield... | 0:42:32 | 0:42:34 | |
..which allows them to slide to safety. | 0:42:37 | 0:42:40 | |
And this limpet has its own personal bodyguard. | 0:42:46 | 0:42:50 | |
A scale worm, with a nasty nip! | 0:42:58 | 0:43:01 | |
The starfish prefers food that doesn't bite back. | 0:43:06 | 0:43:11 | |
The limpet carries on, | 0:43:13 | 0:43:14 | |
its bodyguard tucked safe under its shell. | 0:43:14 | 0:43:18 | |
But there is one creature that limpets have no defence against. | 0:43:20 | 0:43:25 | |
A clingfish. | 0:43:29 | 0:43:31 | |
It has teeth that can lever under the shell.. | 0:43:33 | 0:43:36 | |
..and twist the limpet off like a bottle top. | 0:43:38 | 0:43:41 | |
The clingfish then swallows it, shell and all. | 0:43:45 | 0:43:49 | |
Rock pool dramas like these last just a few short hours | 0:43:58 | 0:44:02 | |
before the tide returns. | 0:44:02 | 0:44:05 | |
Every day, the sea becomes land, | 0:44:09 | 0:44:11 | |
and the land becomes sea... | 0:44:11 | 0:44:14 | |
..bringing new opportunities. | 0:44:22 | 0:44:24 | |
A Sally Lightfoot crab. | 0:44:28 | 0:44:30 | |
One of thousands of shore crabs just waiting for their moment. | 0:44:33 | 0:44:37 | |
Every day, they gather on the rocky shores of Brazil... | 0:44:40 | 0:44:43 | |
..waiting for the tide to go out... | 0:44:47 | 0:44:50 | |
..which exposes their feeding grounds... | 0:44:59 | 0:45:02 | |
..seaweed-covered rocks, 100 metres from the shore. | 0:45:02 | 0:45:07 | |
Getting there is a race against the tide. | 0:45:16 | 0:45:19 | |
They leap from rock to rock. | 0:45:25 | 0:45:28 | |
These crabs seem to be afraid of the water. | 0:45:42 | 0:45:46 | |
And for good reason. | 0:45:59 | 0:46:01 | |
A moray eel. | 0:46:12 | 0:46:14 | |
The chain moray is a specialist crab-hunter. | 0:46:16 | 0:46:20 | |
Its blunt teeth can easily grip and crush a crab's shell. | 0:46:25 | 0:46:30 | |
It's the crab's deadliest enemy. | 0:46:36 | 0:46:39 | |
But the crabs' feeding grounds are still a long way off. | 0:46:49 | 0:46:53 | |
They must press on. | 0:46:59 | 0:47:02 | |
Halfway. | 0:47:24 | 0:47:26 | |
But their enemy has other ideas... | 0:47:30 | 0:47:33 | |
..crossing the land... | 0:47:39 | 0:47:41 | |
..to reset the ambush. | 0:47:47 | 0:47:50 | |
To feed, the crabs must keep going. | 0:47:53 | 0:47:56 | |
But nowhere is safe. | 0:48:02 | 0:48:04 | |
An octopus, also a crab-killer. | 0:48:09 | 0:48:11 | |
The crabs make a dash for it. | 0:48:37 | 0:48:39 | |
Made it! | 0:49:06 | 0:49:07 | |
Risking life and limb to graze on these seaweed pastures. | 0:49:16 | 0:49:21 | |
But in two hours' time, when the tide starts to turn, | 0:49:25 | 0:49:29 | |
they will have to run the gauntlet all over again. | 0:49:29 | 0:49:33 | |
As we leave our coasts and head for the high seas, | 0:49:52 | 0:49:56 | |
we enter the big blue. | 0:49:56 | 0:49:58 | |
Covering over half our planet's surface, | 0:50:07 | 0:50:10 | |
it's the world's greatest wilderness. | 0:50:10 | 0:50:12 | |
Here, there is nowhere to hide and little to eat. | 0:50:23 | 0:50:27 | |
It's the marine equivalent of a desert. | 0:50:32 | 0:50:34 | |
But there are rare moments | 0:50:39 | 0:50:41 | |
when these empty seas are filled with life. | 0:50:41 | 0:50:45 | |
Lanternfish, off the Pacific coast of Costa Rica. | 0:50:54 | 0:50:59 | |
They're scarcely bigger than minnows, but what they lack in size, | 0:50:59 | 0:51:02 | |
they make up for in numbers. | 0:51:02 | 0:51:05 | |
They are one of the most numerous fish anywhere. | 0:51:08 | 0:51:12 | |
Normally, they only come to the surface at night, | 0:51:19 | 0:51:22 | |
to feed on plankton, | 0:51:22 | 0:51:24 | |
but this immense shoal has risen during the day, | 0:51:24 | 0:51:27 | |
almost certainly in order to spawn. | 0:51:27 | 0:51:29 | |
For open-ocean hunters, this would be a bonanza. | 0:51:38 | 0:51:42 | |
DOLPHINS SING | 0:51:47 | 0:51:49 | |
Spinner dolphins. | 0:51:52 | 0:51:54 | |
They're named after their acrobatic leaps. | 0:51:58 | 0:52:01 | |
They stick together in a super-pod, 5,000 strong. | 0:52:06 | 0:52:09 | |
And now they have located the shoal, using their echo-sounding calls. | 0:52:13 | 0:52:17 | |
But they have to get to it quickly. | 0:52:18 | 0:52:21 | |
They are not the only hunters here. | 0:52:24 | 0:52:26 | |
Yellowfin tuna have also detected the shoal. | 0:52:26 | 0:52:30 | |
And behind them, with their two-metre wingspans, mobula rays. | 0:52:39 | 0:52:43 | |
Now sailfish, one of the fastest fish in the sea, | 0:52:53 | 0:52:57 | |
have joined the chase. | 0:52:57 | 0:52:59 | |
The lanternfish may return to the deep at any moment. | 0:53:05 | 0:53:09 | |
But now the dolphins have got here. | 0:53:16 | 0:53:19 | |
DOLPHINS SING | 0:53:19 | 0:53:22 | |
They swim beneath the shoal, pinning it to the surface | 0:53:46 | 0:53:49 | |
and forcing the lanternfish to pack more closely together. | 0:53:49 | 0:53:53 | |
And now the sea begins to boil. | 0:54:00 | 0:54:03 | |
The tuna charge into the shoal at over 40mph. | 0:54:12 | 0:54:16 | |
The slower-swimming rays arrive at last. | 0:54:47 | 0:54:50 | |
With their immense mouths agape, | 0:54:57 | 0:54:59 | |
they scoop up the lanternfish by the hundred. | 0:54:59 | 0:55:02 | |
The shoal has now been largely dispersed, | 0:55:05 | 0:55:09 | |
and the sailfish pick off the survivors. | 0:55:09 | 0:55:12 | |
In just 15 minutes, all that's left is a | 0:55:15 | 0:55:19 | |
silvery confetti of scales. | 0:55:19 | 0:55:21 | |
But here, such feasts are only too infrequent. | 0:55:33 | 0:55:37 | |
Whilst the dolphins perform great feats of endurance, | 0:55:45 | 0:55:49 | |
others are driven to even greater extremes | 0:55:49 | 0:55:51 | |
to find food in this ocean desert. | 0:55:51 | 0:55:55 | |
A sleeping giant. | 0:56:13 | 0:56:15 | |
A sperm whale. | 0:56:19 | 0:56:21 | |
This family is resting between bouts of feeding. | 0:56:28 | 0:56:32 | |
Who knows what the owners of the biggest brain in the planet | 0:56:39 | 0:56:43 | |
dream about? | 0:56:43 | 0:56:45 | |
One has a calf. | 0:56:51 | 0:56:53 | |
It's about two weeks old, but still dependent on its mother's milk. | 0:56:55 | 0:56:59 | |
It's hungry. | 0:56:59 | 0:57:01 | |
It communicates with its mother using a | 0:57:05 | 0:57:08 | |
pattern of clicks. | 0:57:08 | 0:57:10 | |
CLICKING | 0:57:10 | 0:57:12 | |
But its mother slumbers on. | 0:57:15 | 0:57:18 | |
The calf, covered in suckerfish, of which it can't yet rid itself, | 0:57:23 | 0:57:28 | |
has to be patient. | 0:57:28 | 0:57:30 | |
Sleep over and refreshed, | 0:57:57 | 0:58:00 | |
the whales move on. | 0:58:00 | 0:58:02 | |
Sperm whales don't wait for their prey to | 0:58:04 | 0:58:07 | |
rise to the surface. | 0:58:07 | 0:58:09 | |
They swim down into the depths to find it. | 0:58:09 | 0:58:12 | |
They take a series of heavy breaths... | 0:58:17 | 0:58:20 | |
..to saturate their blood with oxygen... | 0:58:23 | 0:58:25 | |
..then down they go. | 0:58:28 | 0:58:30 | |
This entire family dives together in search of squid. | 0:58:39 | 0:58:42 | |
A mother will push her body to the limits of her endurance, | 0:58:51 | 0:58:54 | |
and already it's hard for her calf to keep up with her. | 0:58:54 | 0:58:59 | |
CLICKING | 0:58:59 | 0:59:01 | |
The calf sticks to its mother as closely as it can... | 0:59:09 | 0:59:12 | |
CLICKING | 0:59:12 | 0:59:14 | |
..touching her frequently... | 0:59:14 | 0:59:16 | |
..as if for reassurance. | 0:59:18 | 0:59:20 | |
But 300 metres down, | 0:59:33 | 0:59:36 | |
it seems the calf can't hold its breath any longer. | 0:59:36 | 0:59:39 | |
In their early years, calves are forced to sit out the hunt. | 1:00:03 | 1:00:08 | |
The adults continue their dive. | 1:00:13 | 1:00:16 | |
The mother changes her calls into a series of louder | 1:00:29 | 1:00:33 | |
and more rapid clicks. | 1:00:33 | 1:00:35 | |
CLICKING | 1:00:35 | 1:00:38 | |
She's now using sonar to hunt down shoals of squid. | 1:00:41 | 1:00:45 | |
At 800 metres, a burst of clicks. | 1:00:53 | 1:00:56 | |
CLICKING QUICKENS | 1:00:56 | 1:00:59 | |
Then silence. | 1:01:06 | 1:01:08 | |
She's made a catch. | 1:01:10 | 1:01:12 | |
A calf can have a long wait at the surface. | 1:01:24 | 1:01:27 | |
A mother returns from the deep after as much as an hour. | 1:01:33 | 1:01:38 | |
She has a stomach full of squid. | 1:01:40 | 1:01:43 | |
Finally, this hungry calf can take some milk. | 1:02:02 | 1:02:06 | |
It's one of the richest produced by any mammal, | 1:02:12 | 1:02:15 | |
and the calf guzzles a bath full of it a day. | 1:02:15 | 1:02:19 | |
It may be six years before a calf masters the art of deep diving | 1:02:35 | 1:02:41 | |
and is able to find food for itself. | 1:02:41 | 1:02:44 | |
Over half of all animals in the open ocean drift in currents. | 1:03:05 | 1:03:10 | |
Jellyfish cross entire oceans, | 1:03:26 | 1:03:29 | |
feeding on whatever happens | 1:03:29 | 1:03:31 | |
to tangle with their tentacles. | 1:03:31 | 1:03:34 | |
And when, by lucky chance, | 1:03:43 | 1:03:45 | |
they encounter a patch of sea rich in plankton... | 1:03:45 | 1:03:48 | |
..their numbers explode. | 1:03:51 | 1:03:53 | |
It's such a successful strategy that jellies are | 1:04:04 | 1:04:08 | |
one of the most common life forms on the planet. | 1:04:08 | 1:04:12 | |
But among the jellies, and looking somewhat like them, | 1:04:25 | 1:04:28 | |
is a rather more complex and sinister creature. | 1:04:28 | 1:04:31 | |
The Portuguese man o' war. | 1:04:37 | 1:04:40 | |
It floats with the help of a gas-filled bladder, | 1:04:44 | 1:04:48 | |
topped by a vertical membrane. | 1:04:48 | 1:04:50 | |
With that serving as a sail, it maintains a | 1:04:51 | 1:04:55 | |
steady course through the waves. | 1:04:55 | 1:04:57 | |
Long tentacles trail behind it. | 1:05:00 | 1:05:02 | |
Each is armed with many thousands of stinging cells. | 1:05:05 | 1:05:10 | |
A single tentacle could kill a fish or, in rare cases, a human. | 1:05:12 | 1:05:16 | |
A tentacle has caught this one and reels it in. | 1:05:27 | 1:05:31 | |
It's already paralysed. | 1:05:38 | 1:05:40 | |
This voracious man o' war may collect | 1:05:44 | 1:05:46 | |
over 100 small fish in a day. | 1:05:46 | 1:05:49 | |
BIRDS SQUAWK | 1:05:56 | 1:05:59 | |
Parts of the open ocean are deeper than the highest mountains | 1:06:08 | 1:06:12 | |
that rise on the land. | 1:06:12 | 1:06:14 | |
Now we can dive these uncharted depths to discover what | 1:06:22 | 1:06:26 | |
secrets lie beneath. | 1:06:26 | 1:06:28 | |
The deep ocean is as challenging to explore as space. | 1:06:42 | 1:06:47 | |
Ready to carry on with the launch. All clear. | 1:06:55 | 1:06:58 | |
We know more about the surface of Mars | 1:07:00 | 1:07:02 | |
than we do about the deepest parts of our seas. | 1:07:02 | 1:07:06 | |
As we descend into the deep, | 1:07:14 | 1:07:17 | |
the pressure increases... | 1:07:17 | 1:07:19 | |
..and the lights from above all but disappears. | 1:07:21 | 1:07:25 | |
INDISTINCT RADIO CHATTER | 1:07:27 | 1:07:30 | |
200 metres down, we enter an alien world... | 1:07:30 | 1:07:33 | |
..the twilight zone, | 1:07:36 | 1:07:39 | |
a sea of eternal gloom. | 1:07:39 | 1:07:41 | |
Survival here means making the most of every last glimmer. | 1:07:52 | 1:07:56 | |
A squid, but this is one that lives only here. | 1:08:00 | 1:08:03 | |
Its right eye looks permanently downwards. | 1:08:05 | 1:08:08 | |
But its left eye is much bigger and trained upwards to detect the | 1:08:10 | 1:08:14 | |
silhouettes of prey swimming nearer the surface. | 1:08:14 | 1:08:17 | |
No wonder it's nicknamed "the cockeyed squid". | 1:08:19 | 1:08:23 | |
And even stranger... | 1:08:29 | 1:08:31 | |
this is barreleye... | 1:08:33 | 1:08:36 | |
..a fish with a transparent head, | 1:08:38 | 1:08:41 | |
filled with jelly, so that it can look up | 1:08:41 | 1:08:45 | |
through its skull. | 1:08:45 | 1:08:47 | |
We now know that the twilight zone is a | 1:09:01 | 1:09:04 | |
refuge for an incredible 90% of all fish in the ocean. | 1:09:04 | 1:09:09 | |
CRASHING THUD | 1:09:12 | 1:09:14 | |
Humboldt squid. | 1:09:16 | 1:09:18 | |
Two metres long | 1:09:30 | 1:09:32 | |
and 50 kilos in weight. | 1:09:32 | 1:09:33 | |
Like most squid, they're voracious hunters. | 1:09:39 | 1:09:42 | |
They've found a shoal of lanternfish, | 1:09:48 | 1:09:51 | |
hiding 800 metres down, off the coast of South America. | 1:09:51 | 1:09:55 | |
Their tentacles are armed with powerful suckers | 1:10:06 | 1:10:10 | |
with which they grab their prey. | 1:10:10 | 1:10:12 | |
And when there are no more lanternfish to be found, | 1:10:28 | 1:10:32 | |
they turn on each other. | 1:10:32 | 1:10:35 | |
This squid has caught a smaller one in its tentacles. | 1:10:46 | 1:10:50 | |
To hide its capture from the rest, | 1:10:55 | 1:10:57 | |
it releases a smokescreen of black ink. | 1:10:57 | 1:11:00 | |
But then an even bigger one challenges it... | 1:11:12 | 1:11:15 | |
..and steals its catch. | 1:11:21 | 1:11:24 | |
Below the twilight zone lies a world | 1:11:34 | 1:11:37 | |
of perpetual blackness... | 1:11:37 | 1:11:39 | |
..leading, eventually, to the deep sea floor. | 1:11:48 | 1:11:52 | |
Here, there is a layer of mud, in places a mile thick. | 1:11:58 | 1:12:02 | |
The deep seabed may at first appear lifeless... | 1:12:24 | 1:12:28 | |
..but it's home to a unique cast of mud-dwellers. | 1:12:31 | 1:12:35 | |
The sea toad. | 1:12:41 | 1:12:43 | |
This fish has been living for so long here that its fins have | 1:12:47 | 1:12:52 | |
changed into something more useful. | 1:12:52 | 1:12:55 | |
Feet. | 1:13:00 | 1:13:02 | |
They help it shuffle about on the sea floor. | 1:13:06 | 1:13:10 | |
The flapjack octopus. | 1:13:28 | 1:13:31 | |
It hovers just above the surface of the mud | 1:13:35 | 1:13:38 | |
as it delicately sifts through it, searching for worms. | 1:13:38 | 1:13:42 | |
Down here, over time, organic matter slowly decays... | 1:13:58 | 1:14:03 | |
WHOOSHING | 1:14:05 | 1:14:07 | |
..creating a volcano of methane gas. | 1:14:07 | 1:14:11 | |
RUMBLING AND WHOOSHING | 1:14:13 | 1:14:17 | |
In the Gulf of Mexico, | 1:14:50 | 1:14:52 | |
these eruptions also release a super-salty liquid. | 1:14:52 | 1:14:56 | |
Brine. | 1:15:00 | 1:15:02 | |
Heavier than seawater, | 1:15:13 | 1:15:15 | |
it accumulates in great pools on the sea floor. | 1:15:15 | 1:15:18 | |
A lake of concentrated saltwater, 15 metres deep, | 1:15:23 | 1:15:28 | |
at the bottom of the sea. | 1:15:28 | 1:15:31 | |
Cut-throat eels, scavengers, | 1:15:44 | 1:15:47 | |
come to the shores of the brine lake | 1:15:47 | 1:15:50 | |
in search of something edible. | 1:15:50 | 1:15:52 | |
Spending too long in it can send an eel into toxic shock. | 1:16:23 | 1:16:28 | |
Its only hope is to rise above it. | 1:16:40 | 1:16:42 | |
It manages to escape. | 1:16:57 | 1:16:59 | |
Conditions in the deep sea may be hostile... | 1:17:08 | 1:17:11 | |
..but, astonishingly, there is more life | 1:17:18 | 1:17:21 | |
down here than anywhere else on Earth. | 1:17:21 | 1:17:24 | |
As far down as 3½ miles, there are more | 1:17:38 | 1:17:42 | |
species of coral in the deep than on the shallow tropical reefs. | 1:17:42 | 1:17:47 | |
The deep may be full of alien-like creatures, | 1:17:54 | 1:17:57 | |
but we are more closely connected to it | 1:17:57 | 1:18:00 | |
than we ever thought possible... | 1:18:00 | 1:18:03 | |
..thanks to great ocean currents. | 1:18:09 | 1:18:11 | |
These currents begin in the frozen poles. | 1:18:24 | 1:18:28 | |
Antarctica. | 1:18:39 | 1:18:40 | |
Here, the surface waters are so cold and heavy that they sink... | 1:18:55 | 1:19:00 | |
..and that creates immense rivers of water that flow into the deep. | 1:19:03 | 1:19:08 | |
This is the start of a giant network of currents... | 1:19:11 | 1:19:15 | |
..that flow from the poles to the tropics | 1:19:18 | 1:19:21 | |
and back again... | 1:19:21 | 1:19:22 | |
..linking every ocean. | 1:19:25 | 1:19:27 | |
These currents are in fact crucial to the wellbeing of our planet. | 1:19:32 | 1:19:36 | |
They distribute the sun's heat, | 1:19:39 | 1:19:41 | |
maintaining a favourable climate for life on Earth. | 1:19:41 | 1:19:45 | |
From creating the weather to producing oxygen, | 1:19:50 | 1:19:53 | |
the seas keep our world healthy. | 1:19:53 | 1:19:56 | |
But just as we are discovering how dependent we are on the oceans, | 1:20:04 | 1:20:08 | |
there are worrying signs that they are warming at a faster rate than | 1:20:08 | 1:20:13 | |
ever before in human history. | 1:20:13 | 1:20:16 | |
And nowhere is this more extreme than in the Arctic. | 1:20:20 | 1:20:23 | |
Here, in the past 30 years, | 1:20:27 | 1:20:29 | |
the extent of the ice in summer has been reduced by 40%. | 1:20:29 | 1:20:34 | |
This sudden warming, | 1:20:35 | 1:20:37 | |
most likely a consequence of human activity, | 1:20:37 | 1:20:40 | |
is having a profound impact on its wildlife. | 1:20:40 | 1:20:44 | |
Walruses are among those that are seriously affected. | 1:20:48 | 1:20:53 | |
LOW GROWLING | 1:20:55 | 1:20:57 | |
The sea ice is retreating from much of the walrus's traditional range, | 1:20:57 | 1:21:01 | |
so they now have to haul out on dry land. | 1:21:01 | 1:21:04 | |
But a herd of hundreds of quarrelsome mothers, | 1:21:04 | 1:21:08 | |
some weighing almost a ton, is not an ideal nursery. | 1:21:08 | 1:21:13 | |
THEY GRUNT AND GROWL | 1:21:13 | 1:21:16 | |
Walruses on land stick together for good reason. | 1:21:22 | 1:21:26 | |
Polar bears. | 1:21:28 | 1:21:31 | |
A full-grown male walrus is gigantic - | 1:21:33 | 1:21:37 | |
too big for even a polar bear to tackle. | 1:21:37 | 1:21:40 | |
So the bear is looking for a walrus baby. | 1:21:42 | 1:21:46 | |
THEY SNARL | 1:21:49 | 1:21:52 | |
The scent of the bear spreads alarm through the colony. | 1:21:52 | 1:21:55 | |
The walruses retreat into the sea. | 1:22:02 | 1:22:05 | |
The bear knows it won't be able to catch them there. | 1:22:23 | 1:22:27 | |
But she too has young ones to feed. | 1:22:36 | 1:22:39 | |
What is a mother to do? | 1:22:46 | 1:22:49 | |
WALRUS BARKS | 1:22:57 | 1:22:59 | |
A mother walrus still needs to find a place | 1:22:59 | 1:23:02 | |
where her young can rest. | 1:23:02 | 1:23:04 | |
A melting iceberg might do. | 1:23:12 | 1:23:14 | |
But she is not the first to find this one. | 1:23:15 | 1:23:18 | |
Suitable places are already taken. | 1:23:26 | 1:23:28 | |
Other mothers don't want to share. | 1:24:02 | 1:24:04 | |
They too need a patch of ice where they | 1:24:09 | 1:24:12 | |
can protect their young. | 1:24:12 | 1:24:14 | |
The desperate mother has no choice but to barge her way in. | 1:24:18 | 1:24:23 | |
THEY GROWL AND SNARL | 1:24:23 | 1:24:27 | |
So, this time, everyone loses. | 1:24:47 | 1:24:50 | |
Finding the right place on these melting shores | 1:25:15 | 1:25:18 | |
gets harder and harder. | 1:25:18 | 1:25:20 | |
Solving these problems together helps create a bond so strong that | 1:25:56 | 1:26:01 | |
the mother will stay in contact with her young for the rest of her life. | 1:26:01 | 1:26:06 | |
But who knows now what their future will be? | 1:26:18 | 1:26:22 | |
As we understand more about the complexity of the lives | 1:26:35 | 1:26:39 | |
of sea creatures, | 1:26:39 | 1:26:41 | |
so we begin to appreciate the fragility of their home. | 1:26:41 | 1:26:46 | |
We are at a unique stage in our history. | 1:26:55 | 1:26:58 | |
Never before have we had such an awareness of what we are | 1:26:58 | 1:27:03 | |
doing to the planet, | 1:27:03 | 1:27:05 | |
and never before have we had the power | 1:27:05 | 1:27:09 | |
to do something about that. | 1:27:09 | 1:27:11 | |
Surely we have a responsibility to care for our Blue Planet. | 1:27:13 | 1:27:16 | |
The future of humanity, | 1:27:18 | 1:27:20 | |
and indeed all life on Earth, | 1:27:20 | 1:27:23 | |
now depends on us. | 1:27:23 | 1:27:26 | |
To find out more about our oceans with | 1:27:30 | 1:27:32 | |
this free poster, call... | 1:27:32 | 1:27:37 | |
..or go to... | 1:27:37 | 1:27:42 | |
..and follow the links to the Open University. | 1:27:42 | 1:27:45 |