Hold your breath. Thai cave rescue hero Dr Richard “Harry” Harris takes on his most perilous adventure yet in Jennifer Peedom’s latest nail biter (Sherpa, Mountain, River).

In a remote part of New Zealand’s South Island, “Harry” and his fellow underwater obsessives set out to dive what could be the deepest-dived cave system in the world. Controversially, they plan to use hydrogen as a breathing gas – its explosive nature adding to the many hazards the close-knit team faces. As the 2019 Australian of the Year prepares to confront the dark waters and life-threatening cold, he questions the costs of his passion. Award winning director Peedom captures the tension, euphoria and mateship of this endeavour using Harris’s own vertigo-inducing cave footage, along with striking above-ground imagery and a compelling score.