Solo diving II. In the late 1940s, after the invention of the Aqua-lung by Cousteau and Gagnan, the first retail underwater breathing apparatus for sport was commercially marketed. As the sport expanded through the 1950s, several sporting organisations – notably the Young Men's Christian Association (YMCA) – began scuba training programmes for swimming enthusiasts, thus began the codification of what was believed to be proper practices for the expanding amateur sport of scuba diving. The buddy system was thought to be a useful corollary to the "never swim alone" edicts of the YMCA swimming and lifesaving programmes. Cousteau independently implemented a buddy
Aqua Lung America Aqua Lung America Aqua Lung America (formerly U.S. Divers Company) is an American company based in Vista, California which makes scuba equipment. The company is a division of Aqua Lung International, which was, for most of its existence, a division of Air Liquide. Aqua Lung International was sold by Air Liquide to Montagu Private Equity by the end of 2016. After U.S. Divers Company was renamed Aqua Lung America, the name U.S. Divers was retained as a trademark for Aqua Lung's line of snorkelling equipment. The "Aqua-Lung" regulator was created by Jacques-Yves Cousteau and Émile Gagnan in 1943. In 1946,