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Natalia Molchanova, widely regarded as the greatest free diver in history is feared to have died diving off the coast of Spain. Sportshour's Sarah Mulkerrins speak to William Truebridge, the current world champion and double world record holder, about Natalia’s life and legacy.

PHOTO: Russian Natalia Molchanova shows the minus 86 metres tag that gives her a win in the first women's free-diving world championship September 2005 (CREDIT: JACQUES MUNCH/AFP/Getty Images)