In the high-stakes sport, athletes descend as far to the ocean depths as they can on a single breath. They are used to putting their lives at risk. But a new concern is now splitting their community: drug use

After weeks of chasing him, Lydia finally speaks to Vitomir Maričić, the Croatian freediver at the heart of the scandal – and he tells his side of the story.

An anti-doping officer tells Lydia that drugs are only considered a problem in freediving on social media, and in podcasts. She learns the problem is bigger, and more complex, and more corrupt, than she realised.   

The CEO of the United States Anti-Doping Agency – and the man who caught Lance Armstrong – has advice for Lydia. It's not what she's expecting.   

Vertical Blue, 2023, the moment the doping scandal erupts. The competition organiser, William Trubridge, recounts his plan to catch the dopers – and Lydia investigates the fallout of a very controversial drugs bust.

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. And then she stumbled on a darker side of the sport. Rumours were swirling that a group of top divers were doping to go deeper. So she decided to investigate. Deep Water is the latest Tortoise Investigates series from The Observer.

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?   

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.  

Three years ago travel writer Lydia Gard discovered freediving almost by accident. It's an extreme and beautiful sport defined by one simple objective: to dive as deep as you can on one single breath. Record holders are now routinely diving to more than 120 metres, pushing the sport and their bodies to find out what's humanly possible. Through her coach, Lydia was drawn into a small but fanatical community of competition athletes all united in their drive for depth, and that's where she stumbled on a darker side of the sport. Rumours swirled that a group of top divers were doping to get deeper, faster. As the community began to turn on each other over the allegations, one prominent diver decided to take the law into his own hands. A secret sting operation was meant to put an end to the problem by bringing the alleged dopers out of the dark, and into the light. But the issue hasn't gone away. And now, a lot of people who've been too scared to speak up, are ready to talk.