Welcome to the Royal Marines Commando School.
Here, 56 raw recruits face the brutal challenge of a 32-week long training course, designed to push applicants to the very limits of their physical and mental endurance.
Under the watchful gaze of drill instructor Corporal "Froggy" Chauffour, the men will find out if they have what it takes to join one of the most revered infantry units in the world.
As the weeks go by their numbers get fewer and fewer until only a few remain, and the infamous Commando tests are all that stand between them and the famous green beret of the Royal Marines.
Who will have what it takes?
South African audiences have access to five BBC TV channels: BBC Brit, BBC Lifestyle, BBC Earth, CBeebies and BBC World News.