A simple GPS app on a smart phone will do the job. Geraldo Rivera was outside the tunnel spouting his amazement at how that much dirt was moved with nobody getting suspicious, he should know that it was noticed but all it took was a few US narco dollars to pay the folks to look the other way. I have an old friend in an Oklahoma correctional center who calls me on his cell phone from behind bars regularly and cell phones are banned there so imagine what a billionaire in Mexico can get smuggled into prison there where corruption is absolute.
True story....your phone does not work 60 feet underground! And cell phone triangulation via AGPS with the towers gets you within 3 feet....and that's on a good day!
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