Opération Survie Solitaire Huascaran: Nicolas Jaeger, a French physician specializing in sports and high-altitude physiology, conducted an experiment by spending two months on the highest peak in the Peruvian Andes, Huascarán. From July to September 1979, Nicolas Jaeger lived alone for 60 days at an altitude of 6,700 meters and studied the effects of hypoxia on his body. He documented his experience on film and later in his book, "Carnet De Solitude," published in 1979.