BBC The Blue Planet (2001) Part 4 Frozen Seas

The definitive story of the blue section of our planet - the oceans - which run from the shores to the open depths of the sea. Programmes include The Blue Planet, The Deep, Open Ocean, Frozen Seas, Seasonal Seas, Coral Seas, Tidal Seas, Coasts, Making Waves, Deep Trouble.

An epic, eight-part series that took five years to complete, The Blue Planet firmly re-establishes the BBC as the world's pre-eminent producer of top quality nature documentaries. Exploring every aspect of marine ecosystems, from coastal marshes to deep-sea trenches and from polar waters to tropical reefs, The Blue Planet is thorough and informative, yet never less than thrilling.

Part 4 Frozen Seas

This episode compares oceanic life in the Arctic and Antarctica. The winter in these regions brings temperatures of minus 50 °C and frozen seas that create the biggest challenge. However, there are polynyas in the Arctic, which are free of ice owing to the pressure of currents on either side, and such places do provide refuge for some species, like the walrus and the bowhead whale. A pod of belugas is shown their movements are limited to a single hole in the ice — therefore putting them at risk of attack from polar bears. Everything changes with the arrival of summer, when melting ice brings a variety of migratory visitors.

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