Marcel Ichac accompanied the mountaineer Armand Charlet, in 1943, in the repetition of the first crossing of the Aiguilles du Diable that the guide of the Chamonix valley had made in 1925. A roped party joined on snow and ice the Col du Géant, reached at the Mont-Blanc-du-Tacul stop and on the Col du Diable. The men cross the needles by climbing chimneys, cracks and abseiling walls. They access the eastern slope of the Mont-Blanc massif which offers a panorama of the Grandes Jorasses and Mont-Blanc. Armand Charlet was the first to reach the summits of four needles above 4000 meters: the Devil's Horn, Pointe Chaubert, Pointe Médiane and Pointe Carmen; he also tells how he successfully climbed the furthest, the Isolated. Marcel Ichac shot these scenes as close as possible to his subject, he responded with this film with a “truth” cinema, the principle of which we find in his later productions.

Account of the first French expedition to the Himalayas, which attempted to climb the hidden peak (Gasherbrum I) in 1936, from the preparations for the trip to the end of the ascent. After a long approach walk through quasi-desert regions, then on a huge glacier, the caravan of 700 porters arrives at the foot of Hidden Peak. The expedition was led by Henry de Ségogne, with Jean Charignon, Pierre Allain, Raymond Leininger, Jean Carle, Jean Deudon, Louis Neltner, Jacques Azémar, doctor Jeand Arlaud and director Marcel Ichac. Weather conditions, logistical problems and a strike among Sherpas forced the team to retire at 6900m on the south face. The film received the Silver Lion at the Venice Film Festival in 1938.