In 1940, the top of the mountain collapsed, reducing the height to . Seventeen years later, on 27 August 1957, the stunt pilot Henri Giraud landed a Piper J-3 Cub on the summit, utilising an -long, -wide runway which had been built earlier that day using materials and men lifted to the summit by helicopters. In the following 18 years, he staged a further 51 landings on the summit before his final landing in 1975, many carrying paying passengers, and often made using skis. The mountain was in 1970 designated as part of the Parc naturel régional du Vercors.