Who is Jacques Cousteau

Jacques-Yves Cousteau (; 11 June 1910 ? 25 June 1997)Cousteau Society was a French naval officer, explorer, ecologist, filmmaker, innovator, scientist, photographer, author and researcher who studied the sea and all forms of life in water. He co-developed the aqua-lung, pioneered marine conservation and was a member of the Académie française.

He was commonly known as "le Commandant Cousteau" or "Captain Cousteau".

:For the firm named Aqualung, see Aqua Lung America. For other uses, see Aqualung (disambiguation).

Aqualung was the original name for the first open-circuit free-swimming underwater breathing sets; the type most familiar at the time was the twin-hose open-circuit scuba, as developed by Emile Gagnan and Jacques-Yves Cousteau in 1943"Year by Year 1943" -- History Channel International, and since then made by various manufacturers with varying design details and number of cylinders. It consists of a high pressure diving cylinder and a diving regulator that supplies the diver with breathing gas at ambient pressure, via a demand valve. Before that, there were a few attempts at constant-flow compressed-air breathing sets.

Category: File - :Buzo.jpg|right|thumb|300px|Scuba diver with air tank clearly visible

Scuba diving ("scuba" originally being an acronym for Self Contained Underwater Breathing Apparatus, although now widely considered a word in its own right) is a form of underwater diving in which a diver uses a scuba set to breathe underwater for recreation, commercial or industrial reasons.

Unlike early diving, which relied exclusively on air pumped from the surface, scuba divers carry their own source of breathing gas (usually compressed air), allowing them greater freedom than with an air line. Both surface supplied and scuba diving allow divers to stay underwater significantly longer than with breath-holding techniques as used in snorkelling and free-diving.

According to the purpose of the dive, a diver usually moves underwater by swimfins attached to his feet, but external propulsion can come from an underwater vehicle, or a sled pulled from the surface.