Yep but what the fail to tell you is they already tunnel underneath tunnels are found and collapsed or filled. This along with trucks crossing unguarded border areas (from loss of tunnel) are the methods of the majority of drug trafficking, people falsely claim that the ports of entry are where the majority of drugs are coming from because the drugs entering from ports of entry are found more, this is an obvious example of how statistics can be false. As for the footings I hope they reach bedrock and even the footings are reinforced with something to break concrete saws. As for finding the tunnels they already have that tech, they just need to add stuff like seismic sensors, cameras with thermal and night modes - and protect them in armored casings (aka make the border area like the areas around area 51). Military forces should be guarding the wall not fighting the cabals wars.