Six weeks into their training, the marine recruits face their first pass-or-fail test. They must complete a tough series of physical challenges in the gym, culminating in three staggeringly high rope climbs. If they fail to complete it they'll have to leave their troop.
This first episode follows 56 new recruits through this so-called 'shock of capture'. The recruits spend these opening weeks living in a 60-bed dorm where their every waking hour is controlled by their drill instructor, Corporal 'Froggy' Chauffour.
The raw recruits take the next step on their training and there are challenging new lessons at every turn. If they can make it through the next three weeks, their families will get invited down to witness their progress and they'll get to go home for the first time since training began.