The final episode of the series reveals who's got what it takes to pass this condensed version of the SAS selection process. Over 48 hours, the remaining six recruits continue the interrogation phase, which takes a sinister turn when interrogators discover revealing paperwork on one of them, blowing the cover story for the entire team. There follows a day of brutal sickeners, culminating in one of the most dangerous underwater tasks featured in the series, and only the physically and mentally elite will make it to the end.