Lydia travels to Kalamata, Greece, a renowned freediving spot to investigate the doping allegations. What substances are athletes meant to be taking? And what are the risks – to them, and to the sport she loves?

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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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