A legendary france oceanographer Кusто, at that time yet young naval officer, thought of a device by means of that daiver could breathe on a depth. Serve of air from a surface here not required him. An inventor named the creation " aqualung", that can be translated as "submarine lungs". The first standard of aqualung was collected and tested by Кusto in a collaboration with specialist on a gas equipment Эмилем Ганьяном. A construction consisted of bulb with air, that registered to the back of daiver, special valve, regulating the serve of air, and also two rubber tubes on that air went straight to a cannon-bit. Under water a skin-diver had to retain a cannon-bit teeth.