Little did she know Joana harboured a secret that could keep her from the waves. A third of the way through Minna Dufton’s documentary, Andrade drops a bombshell: as a 12-year-old she was groomed, drugged and sexually abused by a family friend.

It's about power and strength on top of the water and facing demons under it. It's about trust, it's about letting go.

This is an unusually candid psychological portrait of a damaged yet resilient human being.