Closed Circuit Rebreathers for rent at Film Equipment Hire
Rebreather diving is underwater diving using rebreathers, which recirculate the breathing gas already used by the diver after replacing oxygen used by the diver and removing the carbon dioxide metabolic product. Rebreather diving is used by recreational, military and scientific divers in applications where it has advantages over open circuit scuba, and surface supply of breathing gas is impracticable. The main advantages of rebreather diving are extended gas endurance, and lack of bubbles.
Rebreathers are generally used for scuba applications, but are also occasionally used for bailout systems for surface supplied diving. Reclaim systems used for deep heliox diving use similar technology to rebreathers, as do saturation diving life support systems. Atmospheric diving suits also use rebreather technology to recycle breathing gas, but this article covers the technology, hazards and procedures of ambient pressure rebreathers carried by the diver.
Rebreathers are more complex to use than open circuit scuba, and have more potential points of failure, so acceptably safe use requires a greater level of skill, attention and situational awareness, which is usually derived from understanding the systems, diligent maintenance and overlearning the practical skills of operation and fault recovery.