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The Cave Dwellers were real tunnelers, inasmuch as in construction of their rude dwellings they divided them into several compartments and in most cases chose the base of hills for their operations, boring right through from side to side as recent discoveries have verified. The ancient Egyptians built extensive tunnels for the tombs of their dead as well as for the temples of the living.
When they ventured too close, Johnson would get into a pit that he had dug under the straw as a hiding-hole both for himself and the tunnelers' tools, and quickly cover himself with a huge heap of short packing-straw. A score of times he came near being stepped upon by the Confederates, and more than once the dust of the straw compelled him to sneeze in their very presence.
For two years there had been fierce underground fighting at Hill 60 and elsewhere, when our tunnelers saw the Germans had listened to one another's workings, racing to strike through first to their enemies' galleries and touch off their high-explosive charges.
Where the material is saturated with water as is the case in all subaqueous tunneling it is necessary to use compressed air in connection with the shield. The intensity of air pressure is determined by the depth of the tunnel below the surface of the water above it. The tunnelers work in what are called caissons to which they have access through an air lock.
Our miners, aided by the magnificent work of Australian and Canadian tunnelers, had beaten the enemy into sheer terror of their method of fighting and they had abandoned it, believing that we had also. But we did not, as they found to their cost. I had seen the working of the tunnelers up by Hill 70 and elsewhere.
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