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.   

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.   

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.