Episode 1 of 8
Duration: 58 minutes
David Attenborough narrates a natural history of the oceans. Although 70 per cent of our planet is covered by water, the oceans and many of their inhabitants - such as the blue whale - remain an unexplored mystery. This programme travels to the very depths of the seas to reveal a spectacular variety of life - from alien monsters of the deep to pack-hunting killer whales.
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