Fabien Cousteau in the underwater habitat
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Cousteau grandson attempts to break underwater record

2 June 2014 Last updated at 02:48 BST

Fifty years after the oceanographer Jacques Cousteau spent 30 days living underwater, one of his descendants is aiming to beat his record.

Grandson Fabien Cousteau is planning to spend 31 days living 18 metres underwater.

The BBC's Tom Spender reports.

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