This reminds me of an incident back when I was assisting with a college PJ class.(posted 8186 days ago)The students went into their tiny darkrooms to develop their film for the first time. We sat and waited, heard lots of cussing, waited some more....then behind various doors came "tap tap" etc. But from behind one door came WHAM WHAM WHAM WHAM.
We never did get the steel lid off that tank.