From memory, the cave consists of two 3m deep surface shafts of diameter two meters, connected by c. 4m of 0.60m diameter horizontal phreas at the bottom. From the shaft nearer the Hinter-SMK the phreas continued for another 5-6m before I ran away as it was getting a bit tight. It could well be skinrip durchgang from the huge description given on the website, and I just never made it as far as the awkward climb. Survey is Grade II.
"and the total bastard pants gravel hypodermic foreskin up-your-thunk... There is a fun system of about six openings all in a line near the camp, all connected by cave, the last of which is very tricky to climb out of and in the middle of bunda."- Julian Todd (of course) logbook 1990-07-24a the description continuous in an invective vein and explains the name of the cave.