Expedition-style climbing is akin to trench warfare. High-altitude workers scout the route, break trail, fix lines, and establish fixed camps, each higher than the last. Returning to Base Camp, they scoop up supplies and climb the mountain again, stocking the tents with food and fuel. Then, on the summit push, they climb to the camps again, escorting the clients through crevasse fields and up the slopes. With expedition-style climbs, clients frequently use oxygen during the long and expensive assault on the mountain, and many have no compunction about taking drugs to aid acclimatization.
