Noticed this in the UK National Archive while looking for other bits...
WO 195/7838
Description: Land Mines Sub-Committee: effect on "probability dip" of altering nature and weight of conger filling
HO 196/26
Description: The effect of depth of burial Tellermine 42 upon the probability of its detonation by the 2" Conger. Author: D.C. Brettel and Dr. F.N. David
What's in it... that's another matter... generally a case of luck to find something in the file which noone's noticed because the subject appears too boring!
This company could grab the document if you wanted it -
www.arcre.com - I've used them for stuff, they're reliable.
Tim