Three years ago, travel writer Lydia Gard discovered freediving. An extreme and beautiful sport defined by one objective: to dive as deep as you can on one single breath. It soon became a calling. Then, she stumbled on a darker side of the sport. Rumours that a group of top divers were doping to go deeper.

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Reporter - Lydia Gard

Producer - Gary Marshall.

Music supervision and sound design - Karla Patella

Sound design - Rowan Bishop

Podcast artwork - Lola Williams

Fact checking - Poppy Bullard, Katie Gunning, Amalie Sortland, Madeleine Parr & Jess Swinburne

Executive producer - Basia Cummings

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Andrew Scott and Paul Mescal 'All of Us Strangers'