Making of the cinematographic shooting of "Premier de Cordée" directed by Louis Daquin in the Mont-Blanc massif. In 1943. Alain Pol films the risky adventure of filming in the high mountains with a team of seventy people. The images of the making-of reveal the technical constraints encountered by the actors and technicians: falling rocks, crossing glaciers and long approach walks at altitude to the filming locations. Six actors and technicians will also be injured and the main role - that of Pierre - will be reassigned to André Le Gall following a bad fall by Roger Pigaut.