Calum Best

Fourteen celebrity recruits face the toughest course to date, played out in the unforgiving terrain of the Jordanian desert. They face an intense start to the course, crawling through sand in blistering 40-degree heat, before facing a gas attack.

The recruits take on the gruelling task of moving a broken-down one-tonne Jeep in searing heat and through thick sand.

The recruits must make split-second decisions about whether to shoot in a simulated war zone. Then the recruits are forced to dive backwards from a seven-metre platform into the Gulf of Aqaba in the dead of night.

The celebrity recruits must jump from a helicopter in pairs. They take the life of a teammate in their hands as one of them free-falls from a cliff, being kept from crashing to the ground by their partner.

The recruits compete in three brutal challenges that test their leadership skills. First, they must construct a zipline, then go head-to-head in murderball, and finally, they must work out how to pull a 200kg sled loaded with equipment up a ravine.

The last seven celebs face the final brutal phase of the course, a punishing interrogation featuring ice baths and a burial in a box to force a confession.