In this episode Kate Humble joins British Warship HMS Dragon and her crew of over 200 off the coast of Norway as the ship prepares for its next big mission. With amazing behind-the-scenes access to the British warship that has just been sent to the Mediterranean, Kate is on board to witness them testing their weapons to confirm that the ship and her crew are battle ready.

The Royal Marines Band Service are one of the world's most famous and celebrated military bands and JJ Chalmers has just been invited to join their ranks for a very special performance. But can the unmusical JJ learn enough in just a few weeks, to pass muster as part of the band? As JJ performs with them in front of 2,000 people at Manchester's Bridgewater Hall... we discover whether this former Royal Marine, has what it takes!

The Royal Navy is famous for its royal connections and Kate travels to Britannia Royal Naval College in Dartmouth to discover more about His Majesty King Charles's time in the Senior Service. The then Prince Charles spent six years in the Royal Navy rising to become a captain of his own ship. As well as discovering exactly what Charles got up to during his time at the Naval College, Kate meets a fellow crew member and gets first hand testimony of what it was like to serve alongside the then-future king.

JJ Chalmers learns how a warship performs one of its most dangerous and difficult manoeuvres, refueling at sea. He joins a massive 39 thousand-ton tanker, operated by the Royal Fleet Auxiliary, as it conducts the dangerous operation just 40 metres apart from a moving warship out on the high seas. Kate Humble takes on the extreme Submarine Escape, Rescue, Abandonment & Survival course.