The 1924 British Mount Everest expedition was—after the 1922 British Mount Everest expedition—the second expedition with the goal of achieving the first ascent of Mount Everest.: After two summit attempts in which Edward Norton set a world altitude record of 28,126 feet (8572 m),: the mountaineers George Mallory and Andrew Sandy Irvine disappeared on the third attempt. Their disappearance has given rise to the long-standing unanswered question of whether or not the pair climbed to the summit.: Mallory's body was found in 1999 at 26,760 feet (8155 m), but the resulting clues did not provide conclusive evidence as to whether the summit was reached.