The beautiful coastal city of San Diego in southern California has been the nucleus of underwater exploration, innovation and research throughout sport diving’s relatively short history. Boasted as the home of the first dive club in the world, the first oceanographic research institution to use diving for science, and many of the most influential diving pioneers, San Diego has a rich cultural heritage in sport diving antiquity. Large and significant portions of this history have gone undocumented, as many stories and observations remain accessible only in the memories of these pioneers themselves. However, recreational divers in San Diego represent a large stakeholder group with a highly respected and knowledgeable capacity for shaping local marine resource management choices, and divers rely on the health and protection of these coastlines as a driver for their passions, leisure and fascination. The purpose of the project overall is to tell the history of sport diving in San Diego from the perspectives of those at its forefront.  Oral histories were recorded with eight experienced local San Diego divers who began diving recreationally and went on to become influential contributors to revolutions in marine science, diving technology and ocean resource management.