ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Editorial use only.
Military diver training. Military diver, or frogman, wearing an Aqua Lung COD rebreather. Rebreathers, or closed-circuit breathers, recycle the diver's exhaled gas. This recycling reduces the volume of breathing gas used, making a rebreather lighter and more compact.
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