The difficulties and dangers of mine rescue work on the western front

This is a link to a gung- ho article about tunneler's in the first World War,

-The Difficulties And Dangers Of Mine-rescue Work On The Western Front byLieut.-Colonel D. Dale Logan, d.s.o., m.d., d.p.h.

at the site of the Northern England institute of mechanical engineers, which, has some interesting papers on line. Miners were used as tunnellers in both wars(you tunnel underneath something to blow it up, flood it etc- so on top of the dangers of tunneling without industrial safety standards, the enemy would gas any tunneling operations they identified.

I had not known that tunnelers were over 40, I guess if you were young you went to the trenches. So it would be unlikely that any Snowdon miners were ex tunnelers and is I need to rework my plot-