Episode 5 (S02E05)

JJ Chalmers experiences one of the most perilous operations a warship can undertake: refuelling at sea. He boards a huge 39,000-ton Royal Fleet Auxiliary tanker, which pulls within just 40 metres of a moving warship on the open ocean to carry out the high-stakes manoeuvre. Meanwhile, Kate Humble tackles the gruelling Submarine Escape, Rescue, Abandonment & Survival course, pushing herself through a series of extreme challenges.