Exactly. A series of Arc Light airstrikes along the length of the border with bombs designed to penetrate the ground to a depth of five meters will rid us of those pesky tunnels.
A series of Arc Light airstrikes.....I didn’t think ANYBODY, except me, was old enough to remember those.
On your end of the tunnel put about 10 gallons of gas on a small table, .
Seal up your end with a couple tons of sand bags.
Rig up a way to drop the table and spill the gas.
Wait...
Rig up a way to set off a spark.
Watch the horizon for a giant puff of smoke- that will be the other end of the tunnel.