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Kate Humble and JJ Chalmers are given unprecedented access to the Royal Navy. Cameras on board a British warship follow the hunt for a Russian submarine. Kate gets special clearance to go behind the scenes at Britain's secretive submarine base at Faslane in Scotland. JJ reveals what it takes to be an elite Royal Marine Commando as he journeys back to the beginning of his military career.
Kate Humble enters the secret and clandestine world of submarines. She is invited to step on board a British nuclear powered attack submarine at the secretive base of Faslane in Scotland. Former Royal Marine JJ Chalmers heads back to his old stomping ground, the Royal Marine Commando Training Centre in Devon where his training began 18 years ago.
