Lukas Furtenbach, a well-known mountain guide, led a British team to climb Mount Everest very quickly, using a special xenon gas treatment. The team left London on May 16th, reached the top on May 21st, and came back home just two days later. This new xenon gas treatment, which helps climbers avoid altitude sickness, has caused a lot of discussion and is now being looked into by Nepalese climbing officials. Before the climb, the climbers got ready by training in special tents that simulate high altitude and by having xenon gas treatments at a clinic in Germany. Furtenbach believes that spending less time on the mountain could help the environment, for example, by reducing human waste. He also says that the xenon gas treatment was not used in Nepal itself, and he is confident he can show it is safe for climbers.