Recruits race up a snow-covered mountain dragging a 60kg sled. Exhausted, they must then swim under ice, battling hypothermic conditions, only to discover the weakest will be sent home.

Recruits are chased overland in near freezing temperatures. Once captured, they face intense interrogation before they attempt the final phase of the course, a series of brutal physical tasks called The Sickener, designed to push them over the edge. Who will prove worthy of passing SAS selection?