Western Cwm
An early attempt on Lhotse was by the 1955 International Himalayan Expedition, headed by Norman Dyhrenfurth. It also included two Austrians (cartographer Erwin Schneider and Ernst Senn) and two Swiss (Bruno Spirig and Arthur Spöhel), and was the first expedition in the Everest area to include Americans (Fred Beckey, George Bell, and Richard McGowan). The Nepalese liaison officer was Gaya Nanda Vaidya. They were accompanied by 200 local porters and several climbing Sherpas. After a brief look at the dangerous southern approaches of Lhotse Shar, they turned their attention, during September and October, to the Western Cwm and the northwest face of Lhotse, on which they achieved an altitude of about . They were beaten back by unexpectedly strong wind and low temperatures. Under Schneider's direction, they completed the first map of the Everest area (1:50,000 photogrammetric). The expedition also made several short films covering local cultural topics and made a number of first ascents of smaller peaks in the Khumbu region.