East german gas mask bag

The alternative concept, developed in roughly the same time frame was the closed-circuit scuba. The body consumes and metabolises only a small fraction of inhaled oxygen —the situation is even more wasteful of oxygen when the breathing gas is compressed as it is in scuba systems underwater. The rebreather therefore recycles the exhaled oxygen, while constantly replenishing it from the supply so that the oxygen level does not get depleted. The apparatus also has to chemically remove the exhaled carbon dioxide, as a buildup of CO 2 levels would result in respiratory distress and hypercapnia .

East german gas mask bag

east german gas mask bag

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