JJ Chalmers heads to HMS Raleigh in Cornwall, the home of Royal Navy training, to see how recruits are prepared for the harsh realities of war. Kate Humble is aboard a warship as a brand-new helicopter pilot takes an important step in their career - landing on the deck of a moving warship at sea for the very first time. Also, JJ explores the legacy of HMS Ark Royal, one of the Navy's most iconic aircraft carriers.

Kate Humble is granted rare access aboard the British warship HMS Dragon, and when a ferocious storm hits, she sees how a warship and her crew battle towering seas to stay safe. Dwayne Fields is recruited to take a flight in a Royal Navy helicopter, but first, he must complete the same life-saving training required of every crew member. Also, JJ Chalmers revisits the Falklands Conflict.

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.

JJ Chalmers heads to the unforgiving terrain of Dartmoor to push himself to the limit to find out whether he still has what it takes to match the standards of a Royal Marine. Kate Humble is granted behind-the-scenes access aboard HMS Iron Duke - a frontline British warship with 200 crew on a mission to safeguard the nation's shores.

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.

In this episode, 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. Meeting the submariners that live and work there, Kate gets a taste of what life is like on board a Royal Navy submarine.

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. Last series, despite the injuries he received whilst serving in Afghanistan, JJ attempted to complete the infamous endurance course. It's a punishing 6.5 mile run along muddy paths, bogs, tunnels and obstacles, and last year JJ didn't make the grade and he has decided to give it one last try but has this former Royal Marine still got the physical and mental strength to pass the test this time?

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.

Former Royal Marine JJ Chalmers is given access to the Royal Navy's flagship, HMS Prince of Wales, to reveal how the crew live and work on this powerful British warship. Filmed in October 2025, cameras capture state of the art jets conducting warfighting drills within sight of Iran, just months after it entered into a 12-day war with Israel.