PDMHS was founded in 1959 following a meeting at Sheffield University, and IIRC two of the founders (Mike Smith and Bill Sarjeant) were post-grads in the Geology department; they may also have been in the caving section of SUMC. The early history of PDMHS was recorded in an article in our bulletin, I'll try and find the link as it should be available on our website.Yes, please do AR. His perspective on that bit of caving history would be well worth placing on record.
Wasn't it around then that PDMHs was also founded and was Sheffield-based at first? It'd be interesting to learn more about how these three organisations may (or may not?) be interelated.