lol as if building a gigantic underground tunnel is some resource free endeavor. not only highly dangerous but only the most well financed illegals will be able to afford its use.
Seismic sensors are fantastic tools for detecting when and where tunnels are being dug. If they are sensitive enough they will even tell when there is foot traffic moving through established, even concrete floored, tunnels. They're fantastic.
My cousin worked at Tonopah (area 52) and they have some crazy shit to track people. He was very little on details, but this link will give you some ideas.
lol as if building a gigantic underground tunnel is some resource free endeavor. not only highly dangerous but only the most well financed illegals will be able to afford its use.
Cartels are very well-funded. I bet they put seismic sensors in the wall tho.
Seismic sensors are fantastic tools for detecting when and where tunnels are being dug. If they are sensitive enough they will even tell when there is foot traffic moving through established, even concrete floored, tunnels. They're fantastic.
My cousin worked at Tonopah (area 52) and they have some crazy shit to track people. He was very little on details, but this link will give you some ideas.
https://www.thedrive.com/the-war-zone/16312/take-a-very-rare-look-inside-the-secretive-tonopah-test-range