Underwater breathing apparatus

self-contained underwater breathing apparatus

rubberised canvas diving suit with copper helmet and weighted boots

thumb|Classic twin-hose Cousteau-type aqualung Aqua-Lung was the first open-circuit, self-contained underwater breathing apparatus (or "scuba") to achieve worldwide popularity and commercial success. This class of equipment is now commonly referred to as a twin-hose diving regulator, or demand valve. The Aqua-Lung was invented in France during the winter of 1942–1943 by two Frenchmen: engineer Émile Gagnan and Jacques Cousteau, who was a Naval Lieutenant (). It allowed Cousteau and Gagnan to film and explore underwater more easily.

articulated pressure resistant housing for underwater diver

storage vessel for oxygen

Head enclosure with breathing gas supply worn for underwater diving

hypothetical devices to allow a human to take in oxygen from surrounding water

thumb|A raft used for snuba showing the air cylinder and hoses Snuba is form of surface-supplied diving that uses an underwater breathing system developed by Snuba International. The origin of the word "Snuba" may be a portmanteau of "snorkel" and "scuba", as it bridges the gap between the two. Alternatively, some have identified the term as an acronym for "Surface Nexus Underwater Breathing Apparatus", though this may be a backronym for the portmanteau. The swimmer uses swimfins, a diving mask, weights, and diving regulator as in scuba diving. Instead of coming from tanks strapped to the div