The first ascent of Mount Everest without supplemental oxygen was a groundbreaking achievement in the world of mountaineering, accomplished by Reinhold Messner and Peter Habeler in 1978. They initiated their climb in the spring, a time renowned for favorable weather conditions on Everest. The duo's decision to attempt the summit without the aid of supplemental oxygen was audacious, as it contradicted the long-standing belief that such a high-altitude ascent was impossible without it. Utilizing exceptional skills in high-altitude climbing and profound acclimatization techniques, Messner and Habeler ascended through the treacherous Khumbu Icefall and the notorious Death Zone, where oxygen levels plummet and survival becomes precarious. They reached the summit on May 8, having spent days navigating the harsh conditions of the mountain, illustrating remarkable physical and mental strength. Upon their successful return, their achievement sparked both admiration and controversy within the mountaineering community, prompting discussions on the limits of human capability and the ethics surrounding high-altitude climbs. Their ascent was soon recognized as one of the greatest legendary achievements in the history of mountaineering, inspiring a new generation of climbers to push the boundaries of exploration.