Base Camp was established on 12 April 1953. The next few days were taken up with establishing a route through the Khumbu Icefall, and once opened, teams of Sherpas moved tons of supplies up the mountain. A succession of advanced camps were created, slowly forging higher up the mountain. By 21 May, Wilfrid Noyce and Annullu had reached the psychological milestone of the South Col. Hunt had selected two climbing pairs to attempt the summit. The first pair (Tom Bourdillon and Charles Evans) set out on 26 May but were forced to turn back after becoming exhausted high on the mountain. On the same day, Hunt himself climbed to with Da Namgyal Sherpa to leave a cache of equipment on the Southeast Ridge for the second summit party. On 28 May, the expedition made its second assault on the summit with the second climbing pair. The summit was eventually reached at 11:30 am on 29 May 1953 by the New Zealander Edmund Hillary and Sherpa Tenzing Norgay from Nepal (Norgay had previously ascended to a record mark on Everest with a Swiss expedition of 1952).