Me and my friend had went on a vertical caving trip and were unable to prusik out of a really narrow and muddy ~4 meters shaft. It was really snug around our bodies, and it was impossible to move hands or legs at all in order to operate the ascenders properly. Also it was really hard to down-prusik once I decided to abort my initial attempt (not a pleasant experience being stuck there completely cocooned). Later after some struggling I managed to push my buddy's legs high enough until he got to a wider spot, and than he pulled me up. But is there a correct technique for climbing up in such situations? E.g. a mechanical advantage system with a pulley on a hand ascender and petlz stop as progress capture (a person at he bottom pulling the rope)? Or should we have just left a pulley with additional rope at the top before going down?