Seventeen celebrity recruits face their first challenges in the brutal Special Forces selection course involving being set on fire and surviving a plane crash simulation.
Celebrity recruits must hold their nerves while balancing high above a factory floor, before taking on a drowning survival test.
The final four recruits take part in a petrifying helicopter insertion into enemy territory where they must cover their tracks before retrieving a bag from a 100 metre high cliff face.
The longest cat crawl of any course the recruits have taken thus far, and they must fight against rough, windy conditions.
The recruits take on a dark tunnel filled with obstacles and water, as they attempt to be adaptable and deal with enclosed spaces; tensions rise as the recruits try to work as a team.