CLIMBING TOOLS: 1 prusik ascent of rope
I don't know if or when you would ever do this but here it is anyhow. Ascending a rope with just one prusik. It is hard and takes some effort but lets say you two bud's are shot dead with plazma rifles from space and you are just dangling in a crevasse with one prusik. Now you can crawl out and go whoop some alien ass.