1922 British Mount Everest expedition
The 1922 British Mount Everest expedition was the first mountaineering expedition with the express aim of making the first ascent of Mount Everest. This was also the first expedition that attempted to climb Everest using bottled oxygen. The expedition would attempt to climb Everest from the northern side out of Tibet. At the time, Everest could not be attempted from the south out of Nepal as the country was closed to Western foreigners.