The ladder was into the cellar of the Fischbüro location somewhere in Kreuzberg 36. (these guys started Tresor later)
(Eimer (Bucket) was a really bad location several years later, you wouldn't have been able to get out of the basement if ...)
36 is the cooler, poorer, more political, younger half of the borough, it really was a center for non-conformists after reunification, but it's being gentrified these days.
"36 Brennt, 61 Pennt"
'I’ve tried to come up with a rhyme that works in English: “36’s on fire, 61’s just tired” was one solution, but it doesn’t carry the matter-of-factness of the German.'