The selection process for the SAS is among the most challenging job interviews globally, where physical fitness is merely the initial requirement. The true focus is on evaluating psychological endurance and character as participants face sleep deprivation, interrogation, and progressively intricate mental challenges. In this show, five former special forces operatives replicate tasks from the SAS’s confidential selection procedure, subjecting 30 civilian men to the ultimate examination of their physical and, crucially, psychological fortitude.