The crappy little tunnels the MSM shows us, the ones the Mexicans did are not the tunnels. The tunnels are the underground aquifers that begin in the Rocky Mountains and flow to Mexico. The Wall is useless when they can freely move underground.

Isaiah 2 19

19 And they shall go into the holes of the rocks, and into the caves of the earth, for fear of the LORD, and for the glory of his majesty, when he ariseth to shake terribly the earth.