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
Jacques Cousteau became one of the most important characteristics of modern television broadcasting. The Cousteau Society and its French counterpart, l'Équipe Cousteau, both of which Jacques-Yves Cousteau founded, are still active today. The Society is currently attempting to turn the original "Calypso" into a museum and it is raising funds to build a successor vessel, the "Calypso II". In his last years, after marrying again, Cousteau became involved in a legal battle with his son Jean-Michel over Jean-Michel licensing the Cousteau name for a South Pacific resort, resulting in Jean-Michel Cousteau being ordered by the court not to encourage confusion between his