Nepalese rescue team members rescue a survivor of an avalanche on Mount Everest on April 18, 2014.  At least 12 Nepalese guides preparing routes up Mount Everest for commercial climbers were killed by an avalanche in the most deadly mountaineering accident ever on the world's highest peak, officials and rescuers say. The men were among a large party of Sherpas carrying tents, food and ropes who headed out in bright sunshine in an early morning expedition ahead of the main climbing season starting later this month. AFP PHOTO/Buddhabir RAI        (Photo credit should read Buddhabir RAI/AFP/Getty Images)