Breaking Point

S1, E3: Only thirteen men remain on the course and the training is about to get even more severe. Now, the surviving recruits face the nightmare of Maritime Tactical Operations where sleep will become a distant memory. Clearance Divers must be able to carry out clandestine recognisance operations behind enemy lines. To achieve this they use a special re-breather or bubble free diving set and conduct their operations under the cover of night.