It's the final episode of the series and time to find out who has what it takes to pass this condensed version of SAS selection.
Over a 48-hour period, the remaining seven recruits go into the most psychologically demanding of all the phases: interrogation. The recruits are hooded and exposed to endless white noise, and face brutal tactical questioning from a specialist team of interrogators.
The few who make it through discover that their plight is far from over. A brutal sickener is waiting for them, on the highest point on the island, and only the physically and mentally elite will pass selection.
SAS Who Dares Wins concludes Sunday at 9pm on Channel 4.