Michaella McCollum

The fourteen new recruits face brutal conditions in Wales, the birthplace of the Special Forces. For their first task, the celebs must plunge into the freezing sea, swim to a rendezvous point and attempt to jump onto a moving speedboat.

The last recruits are handed over for interrogation as the trainers use psychological and physical pressure to break them and force a confession. Do any of the recruits have what it takes to pass?

It's all about survival as the recruits do continuous circuits round a quarry. After taking emotional calls from home, they're dispatched on a brutal escape-and-evasion exercise.

A terrifying drop from a 130-foot viaduct is first up, but one celebrity can't take the height and quits. The celebrities write death letters home before fighting the 'redman'.

Forced into a gassing task, the recruits need all their solidarity for a hostage rescue. Camaraderie is also vital as they climb multiple rock faces on an ammo supply mission.

The recruits go head-to-head in a terrifying hang-tough task 160 feet above a quarry, testing mental and physical strength. Then, they take on a car ambush task where they must drive into a simulated war zone.