History of scuba diving the high number of recreational scuba accidents. this started with informal training and led to the creation of training and certification agencies. BS-AC was formed in 1953, CMAS in 1959, NAUI in 1960 and PADI in 1966. The sport of scuba diving had its roots among the multitude of small enthusiastic snorkelling and spearfishing clubs in the decades just before and after the Second World War. After the invention of the "aqualung" by Cousteau and Gagnan, the first commercially marketed underwater breathing apparatus became available for sale for sporting purposes in the late 1940s. In 1951, Jim Auxie Jr and
New materials in 20th-century art Delaunay and scores of young artists in Paris made their first modern paintings venturing toward abstraction and other new ways of formulating figurative, still-life and landscape imagery. During the first decade of the 20th century modern art developed simultaneously in several different areas in Europe (France, England, Scandinavia, Russia, Germany, Italy), and in the United States. Artists began to formulate different directions of modern art, seemingly unrelated to one another. In printmaking, the linocut was invented by the artists of Die Brücke in Germany between 1905 and 1913. At first they described their prints as woodcuts, which sounded more respectable.