I hope it has a billowing roll of razor wire at the top, 6-feet tall and 8 feet deep. It should also have an outward-sloping edge that begins several feet before the top and its walls absolutely devoid of toeholds. I’m trying to figure out how best to prevent tunnels.
Seismic sensors and robotic drilling rigs. Find the tunnel, drill, pump gasoline into hole, ignite.
“I’m trying to figure out how best to prevent tunnels.”
We worked this problem in Korea’s DMZ, and the Israelis are working it hard today.
Seismic sensors can be emplaced that are good for detecting new tunneling activity. Ground penetrating radar is good for detecting existing tunnels.
Wealthy drug cartels will likely employ exceptional techniques, like extremely deep tunneling, but mass migration will be halted.
Continuous Ground Penetrating Radar (GPR) sweeps?