In 1934, Willy Merkl led a well financed German expedition to Nanga Parbat, with the full backing of the new Nazi government. Early in the expedition Alfred Drexel died, probably of high altitude pulmonary edema. The Tyrolean climbers Peter Aschenbrenner and Erwin Schneider reached an estimated height of (7,895 m / 25,900 ft) on July 6, but were forced to return because of worsening weather. On July 7 they and 14 others were trapped by a ferocious storm at 7,480 m (24,540 ft). During the desperate retreat that followed, three famous German mountaineers, Uli Wieland, Willo Welzenbach and Merkl himself, and six Sherpas died of exhaustion, exposure and altitude sickness, and several more suffered severe frostbite. The last survivor to reach safety, Ang Tsering, did so having spent seven days battling through the storm. It has been said that the disaster, for sheer protracted agony, has no parallel in climbing annals.