defcon4
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- Jan 26, 2015
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A small package of C4 will take care of that, no worries. Detecting them is easy enough, we have more sophisticated methods than people had in the medievals and they were detecting tunneling with some success, see below.If Mr Grope does get to build the wall, I can see a future in tunnel-boring equipment.
They've got some serious tunnel expertise down there...
Mexican prison chief, 6 other officials arrested over drug lord tunnel escape
"Of course, ancient defenders knew the dangers of tunnel and sapping operations, and they devised means to detect any enemy tunneling activity. One method was to place drums at key points along the defensive line, and monitor them constantly for the telltale vibrations produced by digging through the earth. Others used bowls of water set along the tops of walls, which also responded to underground disturbances. These methods allowed a crude form of triangulation, by which the defenders could chart the progress of the approaching tunnels. Rather than passively await the enemy’s maneuvers, they could then begin a countermine, attempting to intersect the attackers’ tunnel."
Fighting Under the Earth: The History of Tunneling in Warfare - Foreign Policy Research Institute