Other expeditions to the Verdon included Martel’s team the following year; followed by Robert de Joly, who in 1928 was the first to completely cross the Verdon Gorge, passing over the Imbut; explorer and filmmaker Albert Mahuzier in 1938 and 1939; a group of French Scouts in 1945; and the Canoe Club of France in 1946. Roger Verdegen made several expeditions along the Verdon in a boat made from animal hides and natural rubber, and became an authority on the river and its gorge.