Marines go Underground

[CINDERS]

A good book to read is Beneath Flanders Fields about the the WWI tunneling war the excavation and exploration of them however of the Messines mines that were detonated that day 2 failed to explode one did a long time later after the war when a chance lightning bolt set it off but of the other it is lost in the schwim sands of that salient scary stuff.
Also locked in there is a mechanical tunneling machine the brits used but they the soldiers had a break and whilst away the clay gripped the machine never to release it so it remains to this day along with the poor beggars of both sides killed by cave ins, camouflettes and breaking into each others tunnel and fighting it out in total darkness now that is courage of a different kind.