Porpoise (scuba gear) Porpoises still exist. Only a few of these early models are known today, the rarest being the CA-2, made for use with two tanks. Porpoise (scuba gear) Porpoise is a tradename for scuba developed by Ted Eldred in Australia and made there from the late 1940s onwards. The first Porpoise was a closed circuit oxygen rebreather, and the following models were all single hose open circuit regulators. This rebreather was developed by Ted Eldred in the late 1940s and early 1950s. Some were made and used for sport diving, but they did not go into full production. It was worn
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