In this documentary, Bear Grylls takes us on a journey through the most extreme version of the world's highest and most legendary peak: Mount Everest. Several leading figures in mountaineering and extreme sports, for whom a standard ascent is no longer enough, transform Everest into a laboratory for extreme challenges. Told through archival footage and reenactments, this elite group seeks new forms of performance, attempting to ski the slopes, snowboard down them, hang-glide or paraglide above the summit ridge, open new routes on more technical and exposed faces, and break climbing records. The documentary also highlights the essential role of the Sherpas, the colossal logistics behind each attempt, the explosion of commercial expeditions, and the moral debate surrounding the ever-increasing risks involved in breaking records or achieving unprecedented feats.

Avid for steep slopes, Marco Siffredi (1979-2002) obeys only one rule: not to fall. This gifted kid with hair sometimes blond peroxidized, green or blue clashed in his valley: Chamonix, mecca of mountaineering. His thing was to go up and down on a snowboard. . 90 minutes September 8, 2002, altitude 8848 meters, rare oxygen, his head already brushing the sky and his snowboard running, Marco Siffredi, 23, rushes from the summit of Everest in the Horbein corridor and its slopes at 50 degrees . A year earlier, he had already made the first descent of the mountain on a snowboard. But there remains another corridor… more direct. It's not a challenge, just a reason to be... However, that day, at the top of the roof of the world, his trace is lost...