Buddy diving just before and after the Second World War. After the invention of the "aqualung" by Cousteau and Gagnan, the first commercially underwater breathing apparatus became available for sale for sporting purposes in the late 1940s. As the new sport of scuba diving rapidly expanded through the 1950s, several sporting organisations—notably the YMCA—began programmes to train swimming enthusiasts in this new aquatic pastime, and began to codify what they believed were proper practises for this expanding sport. The YMCA considered the buddy system a useful corollary to the "never swim alone" rule of their swimming and lifesaving programmes. Cousteau himself independently
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",