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Blue Planet II

Series 1

Episode 4: Big Blue

Duration: 59 minutes

on BBC Two Wales

Available for years

The wildlife documentary series narrated by David Attenborough explores a vast ocean desert where sperm whales must dive 1,000 metres just to feed. Show more

BBC Two Wales

About BBC Two

BBC Two is a lively channel of depth and substance, carrying a range of knowledge-building programming complemented by great drama, comedy and arts.