The other day I posted in the Derby' area bad bolts/air etc thread that we had heard a collapse in Wapping. We saw no evidence during our exit, and others had suggested that we heard a fall in Royal/Tear Breeches mine. Had another trip in there to the top of Cumberland, under the shuttering, and saw no evidence of a collapse on the routes we took. The hint from "A_R" would appear to be correct that it was a problem in a neighboring mine