Planet Earth: Season 1, Episode 11

Ocean Deep (25 Mar. 2007)

TV Episode  |  TV-G  |   |  Documentary
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Open ocean, a vast biotope covering two thirds of the planet, some shallow, some as deep as the mountain ranges are high. The ocean has an immense, precariously complex food chain, varying ... See full summary »


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Episode credited cast:
Himself - Narrator (voice)
Narrator - US Version (voice)
Rest of cast listed alphabetically:
Doug Anderson ...
Rick Rosenthal ...


Open ocean, a vast biotope covering two thirds of the planet, some shallow, some as deep as the mountain ranges are high. The ocean has an immense, precariously complex food chain, varying from microscopic animals, like krill, to whales, which ironically feed mainly on the former. Most species swim or float in it, many coming up for air, while other dive in from land or air, often to feed, but also to procreate on the coast, where some species come to lay their eggs. Even the shore is covered with life, largely based on organic matter, such as corpses. Written by KGF Vissers

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Plot Keywords:

ocean | whale | shark | earth | See All (4) »




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Release Date:

25 March 2007 (USA)  »

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[first lines]
Himself - Narrator: Away from all land, the ocean. It covers more than half the surface of our planet. And yet, for the most part, it is beyond our reach. Much of it is virtually empty, a watery desert. All life that is here is locked in a constant search to find food. A struggle to conserve precious energy in the open ocean.
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Planet Earth End Theme
Written by George Fenton
Performed by BBC Concert Orchestra
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User Reviews

Ocean Deep
20 October 2015 | by (India) – See all my reviews

The final instalment concentrates on the least explored area of the planet—the deep ocean. It begins with a whale shark used as a shield by a shoal of bait fish to protect themselves from yellowfin tuna. Also shown is an oceanic whitetip shark trailing rainbow runners. Meanwhile, a 500-strong school of dolphins head for the Azores, where they work together to feast on scad mackerel along with a flock of shearwaters. Down in the ocean's furthest reaches, some creatures defy classification. On the sea floor, scavengers such as the spider crab bide their time, awaiting carrion from above. The volcanic mountain chain at the bottom of the Atlantic Ocean also sustains life through the bacteria that surround its sulphide vents. There are thought to be around 30,000 undersea volcanoes, some of them taller than Mount Everest. Their sheer cliffs provide anchorage for several corals and sponges. Nearer the surface, the currents that surround these seamounts force nutrients up from below and thus marine life around them is abundant. Ascension Island is a nesting ground for frigatebirds and green turtles. Off the Mexican coast, a large group of sailfish feed on another shoal of bait fish, changing colour to signal their intentions to each other, allowing them to coordinate their attack. The last sequence depicts the largest animal on Earth—the blue whale, of which 300,000 once roamed the world's oceans. Now fewer than 3% remain. Planet Earth Diaries shows the search in the Bahamas for oceanic whitetip sharks.

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