Building on Shipton's experience, the Genevans reached the head of the Western Cwm and climbed the huge face above to the desolate, wind-swept plateau of the South Col. Three Swiss climbers and Sherpa Tenzing Norgay continued towards the summit, pitching a tent at 8,400m.
The oxygen sets were barely operable and when the two men continued in the morning, they were effectively climbing without oxygen.