I know Castleton fairly well and often drive through there and up Winnats Pass on the way from work near Sheffield to sessions in Strines (near Marple) and Whaley Bridge.

However, I have only once or twice been down the various caves there. This seems odd on reflection because almost forty years ago I was a mining student and our class frequently went rummaging through various abandoned mines in the UK; at Dolaucothi or Coniston Coppermines, for example. We never had any serious accidents, although trying to trace contacts between a greyish-blue silty shale and a bluish-grey shaly siltstone along a hanging wall (ceiling) covered in "snottites" was not the most pleasant of activities.