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Freediver James Nestor

James Nestor is an American journalist who stumbled across freediving whilst on a reporting trip. James was fascinated and horrified by what he saw - and he went on to explore for himself the power of the ocean in his new book, "Deep". He tells us about learning to dive without breathing equipment - and about swimming with sperm whales.

Picture: a freediver swims with sperm whales
Credit: Fred Buyle/

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8 minutes