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 he sued his son who wished to open a holiday center named "Cousteau" in the Fiji Islands. On 11 January 1996, "Calypso" was accidentally rammed and sunk in the port of Singapore by a barge. The "Calypso" was refloated and towed home to France. Jacques-Yves Cousteau died of a heart attack on 25 June 1997 in Paris, two weeks after his 87th birthday. He was buried in the family vault at Saint-André-de-Cubzac, his birthplace. An homage was paid to him by the town by naming the street which runs out to the house of his birth "rue du Commandant Cousteau",