Celebrity SAS: Who Dares Wins for Stand Up to Cancer

The trainees must prove they can trust their team, their leaders and themselves in a challenge so gruelling it leads to the medical withdrawal of three incapacitated recruits. For the second task of this phase, the celebrities are put through an individual challenge in which both their physicality and trustworthiness are put to the test.

One by one, the recruits must pull themselves across a 300-foot-wide ravine, before dropping 160 feet to the extraction point. An early-hours beasting is designed to weed out the weakest recruits. The recruits must also prove to the supervisors that they have what it takes mentally when they're offered a phone call to their loved ones back home.

The remaining recruits face a rough bout of pontoon wrestling. The hardships of jungle life take their toll, including draining weather, a lack of sleep and a calorie deficit from limited ration packs. This leaves the celebrities in far from their best condition as they embark on a simulated mission behind enemy lines.

For their final challenge, the five remaining celebrities endure intense interrogation, the most feared phase of the course. They must go through psychological and physical punishments designed to break their will and force a confession.