Following a crevasse fall, it is possible that the person in the crevasse will be injured or unconscious and upside down. If the person in the crevasse needs help, then you have to make a decision. Is it better to haul the person out? Or is it better to rappel down into the crevasse to help them...?
Outdoor Research and the American Mountain Guides Association have put together an excellent video on how to rappel into the crevasse and climb back out. Check it out, below:
In the video, Jeff doesn't give enough credit to the fact that this was shot in a late season snowpack. This means that the lip of the crevasse is relatively well consolidated and that it is easy to pad. That is not always the case. Indeed, sometimes climbing back out of the crevasse with a tiny lip is incredibly difficult. It is important to practice that element.
At AAI, it's not uncommon for us to use road cuts early in the season to practice crevasse rescue. This eliminates long hikes and wet gear. If there is a road cut near you that is snowy and doesn't have any traffic, this can be an excellent place for winter or early season crevasse rescue practice.
Climbing in and out of a crevasse is hard. Jeff makes it look easy. But it's not. You'll likely need a lot of practice to dial this in...
--Jason D. Martin