The Mouthpiece Retainer

Though it's not the trigger, the primary cause of death in most rebreather fatalities is drowning. Some of these fatalities might have been prevented if the diver had used a retainer to secure his mouthpiece. Full-face masks and retainer straps have long been the standard in military diving, and they were also a key recommendation from the Rebreather Forum 2 in 1996. While full masks are not very suitable to sport diving, retaining straps have the potential of saving lives.