Western Cwm
The expedition had a climbing team of four but, of the two most experienced members, one died doing the march-in and the other was taken ill. This left only two main climbers, Mallory and Bullock himself. Exploring from the north, they thought that the route from the North Col to the summit looked feasible but that there seemed no good route up to the North Col from where they were, to the west. He and Mallory reached a pass from where they were the first to see the Western Cwm in Nepal. Later Bullock, on a one-man expedition, reached the Lho La pass from which he photographed the Khumbu Icefall for the first time.