Alessia Zecchini as Self - Freediver

Stephen Keenan as Self - Deceased Freediver /Self - Safety Diver

Leigh Baker as Self - Respiratory Therapist

Mahmoud Barracuda as Self - Scuba Diver

Ilaria Boni as Self - Freediver Italian National Team

Kristof Coenen as Self - Freediver

Lily Crespy as Self - Freediver

Hanako Hirose as Self - Freediver Japanese National Team

Peter Keenan as Self - Stephen's Father

Francesca Koe Owings as Self - Freediving Judge

Homar Leuci as Self - Freediver Italian National Team

Alexey Molchanov as Self - Freediver

Adam Skolnick as Self - Sports Journalist

William Trubridge as Self - World Record Holder /Self - Founder Vertical Blue

Kristina Vackova as Self - Underwater Photographer

Nathan Vinski as Self - Freediving Coach

Enzo Zecchini as Self - Alessia's Father