Well that rope showed rugged signs of a life well spent, or something. Anyway. I think two people were psychic: the rigger, and the person who said we didn't need two ropes, as that saved us a lot of hassle. We got to that wall on the pic; David took some more pics of it. We clearly couldn't go on without a second rope, collapse or no collapse. The collapse must have been at the bottom level. There was mention of water backing up somewhere but I don't know details. I bet MartyMarty and/or Newstuff will appear here at some point to give a more rigorous explanation.