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
James May's 20th Century chronological order. The programme is now shown on Eden, Yesterday and Dave. The theme tune is called "The Long Boot", by Jeff Knowler. Sam Wollaston writing for Guardian Unlimited described James May's 20th Century as "essentially Top Gear, masquerading as something educational" but conceded that if "teaching history can be achieved through Top Gear, then maybe that's not such a bad thing". The New Statesman thought that James May was "ill-suited to the task in hand" and described the biggest problem as May being unable to "put his wretched motors behind him". The Lancashire Telegraph wrote positively of the show