A rebreather is a type of breathing set that provides a breathing gas containing oxygen and recycles exhaled gas. This recycling reduces the volume of breathing gas used, making a rebreather lighter and more compact than an open-circuit breathing set for the same duration in environments where humans cannot safely breathe from the atmosphere. In the armed forces it is sometimes called "CCUBA" (Closed Circuit Underwater Breathing Apparatus). Basics Rebreather technology is used in many environments: · Underwater - where it is sometimes known as "closed circuit scuba" or "semi closed scuba", or CCUBA = "closed circuit underwater breathing apparatus", as opposed to Aqua-Lung-type equipment, which is known as "open circuit scuba". · Mine rescue and in industry - where poisonous gases may be present or oxygen may be absent. · Space suits - outer space is, for all intents and purposes, a vacuum where there is no oxygen to support l

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