Endless blue stretches in every direction. The sea bed is a staggering eight kilometers deeper down and the nearest island is 500 kilometers away. There is nothing save the burning sun above and the blackened abyss below. How, then, does life exist?
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Shafts of sunlight are the vital source of energy used by the countless billions of plankton that grow every spring and summer in the world’s temperate sea, the richest of all habitats.
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The ocean’s influence dominates the world's weather systems and supports an enormous range of life. This first episode demonstrates the sheer scale, power and complexity of the "Blue Planet".
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Coral reefs are the rainforests of the sea; fish compete for food, territory and mates within this oasis of life. Incredible time-lapse photography shows the dramatic formation of a coral reef, portraying its inhabitants and its ultimate destruction.
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On the floor of the ocean deep, primitive creatures crawl across the ooze. A place of mountain ranges, perpetual night, pressure extremes, the ocean floor is home to the weirdest life forms on our planet.
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Life on the edge of a frozen sea is tough. Ice at both poles is constantly moving, and in winter freezes solid with air temperatures 70°C below freezing. Only in spring, with the retreating ice and light reaching the water, does life begin again.
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Tidal marshes are one of the most productive parts of the world. Numerous plants support numerous animals, yet life is not easy: predators are attracted to these enormous quantities of food, forcing animals to seek constant protection from attack.
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Blue Planet - Seas of Life, Open Ocean
