In August 1953, the same year that Sir Edmund Hillary and Tenzing Norgay climbed Everest, an American team of seven set out to climb K2 led by Charles Houston. On the seventh day, climbing without oxygen in a storm, they became trapped at over 25,000 feet (7,620 meters) on the Abruzzi Ridge of K2. One of the expedition members, Art Gilkey, collapsed with deep venous thrombosis, followed by pulmonary embolism. Realizing Gilkey would surely die if not taken off the mountain immediately, they began to lower Gilkey, wrapped in a sleeping bag, over treacherous rock and ice in the middle of a storm.