The third series of this nature documentary uses the very latest in underwater filming techniques to reveal brand new and untold stories from magical underwater worlds focusing on five major underwater habitats: the tropical seas, temperate seas, polar seas, high seas and deep seas. Venture deeper beneath the waves. David Attenborough reveals ocean life more surprising, more intelligent and more precious than we ever realised.
Between the tropics and poles lie seas governed by the seasons. From storm-battered winters to the intense heat of summer, it's a world of extremes, but for those that can adapt, opportunity awaits.
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