Crevasse rescue is the process of retrieving a climber from a crevasse in a glacier. Because of the frequency with which climbers break through the snow over a crevasse and fall in, crevasse rescue technique is a standard part of climbing education.
The basic assumption of crevasse rescue is that two or more climbers are tied together with a climbing rope, forming a rope team; a standard number is three, one on each end and one in the middle, which means there are two available to hold a falling climber, but is not as complicated to manage as large numbers of people attached to a single rope.
When the snow gives way under the victim, the others on the team must immediately prepare for the impending yanks, usually by flopping down and digging ice axes and crampons into the snow, facing away from the crevasse if possible, and holding tight until everything stops moving. Many crevasses are small or slanted, and the fallen climber may be able to escape by digging or wiggling out; but if the climber is hanging in midair, one of several rescue techniques will need to be used.
The first step is to stabilize the situation and free up the climbers still outside the crevasse. This can be done in several ways, typically involving one person anchoring the rope with a boot-axe belay, while the other person probes for the edge of the crevasse and attempts to communicate with the victim.
Once the victim reaches the lip of the crevasse, some combination of hauling and flailing will be needed to get over it, since the victim is still suspended by the waist, with feet still in the crevasse.
Although the mechanical principle of rescue is simple, the reality is far messier. The victim may be injured and/or disoriented from the fall, the rescuers on the scene may be anxious or uncertain, equipment and ropes are scattered everywhere, and everybody will likely already be exhausted and out of breath because of the climbing and altitude. It may also be that additional crevasses are nearby, and it has happened that rescuers have died in unsuspected crevasses because they unroped in order to set up a rescue of the first victim.
The experience of world-class climbers Jim Wickwire and Chris Kerrebrock on Mount McKinley in 1981 shows how much can go wrong. Only a two-person team, when Kerrebrock fell in, Wickwire was pulled in after. Wickwire managed to get out of the crevasse, but Kerrebrock was jammed in the bottom, head down. Wickwire tried to pull him out, but his shoulder had been dislocated, and he didn't have the strength; Kerrebrock eventually died of hypothermia, and Wickwire had to run the gauntlet of the remaining crevasses alone.
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