Does anybody know how you find tunnels the owners don't want found? I know ground penetrating radar has come a fair distance since the US started trying to use it against the Vietnamese Communists, but I have no idea what the state of the art is. Can you use sonic technology?
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“We’re not innovating. We’re selectively imitating.” June Bernstein, Acting President of the University of Arizona in Tucson, November 15, 1998.
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