Jacques Cousteau and Pierre-Antoine was released in 1954. During the 1940s, Cousteau is credited with improving the aqua-lung design which gave birth to the open-circuit scuba technology used today. According to his first book, "" (1953), Cousteau started diving with Fernez goggles in 1936, and in 1939 used the self-contained underwater breathing apparatus invented in 1926 by Commander Yves le Prieur. Cousteau was not satisfied with the length of time he could spend underwater with the Le Prieur apparatus so he improved it to extend underwater duration by adding a demand regulator, invented in 1942 by Émile Gagnan. In 1943 Cousteau tried
History of scuba diving before scuba became available. Jacques-Yves Cousteau, co-inventor of the first commercially successful open circuit scuba equipment, is claimed to have been the world's first open circuit scuba cave diver. Two regions have had particular influence on cave diving techniques and equipment due to their very different cave diving environments. These are the United Kingdom, and USA, mainly Florida. The number of sites where standard diving dress could be used is limited and there was little progress before the outbreak of World War II reduced the caving community considerably. The development of underwater warfare made a lot of surplus equipment available