One of the people claimed by Everest mountaineering was the U.S. astronaut Karl Gordon Henize. He was on a mission to study radiation but came down with a fatal case of HAPE in October 1993 and died at north base camp. At the time he was the oldest astronaut to have flown in space and also had a doctorate in astronomy. He died on October 5, 1993, and was buried on Mount Everest.