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Perfect Planet: Oceans (S1EP4 BBC One Sun 24 Jan 2021)

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Oceans: There are not five separate oceans, but one. Its waters linked by powerful forces that keep them on the move. This constant mixing is vital for the health of oceans and marine life.

Airdate: Sun 24 Jan 2021 at 8.00pm on BBC One

Season 1 Episode 4