The tRump wall won't stop the tunnels.

http://www.latimes.com/local/lanow/la-me-border-tunnel-20181009-story.html

Mexican officials discovered a sophisticated cross-border tunnel that began in a home in the town of Jacume less than a football field away from the U.S. border. Sophisticated tunnels take a lot of time and money to make,” Michael said, and they’re not uncommon in the area. “When we find them, they’re a pretty big deal.”

A rail system ran the entire length of the tunnel, and a solar panel system powered lighting and ventilation, according to the Border Patrol. It also had systems to pump out water. The shaft at the tunnel’s entry was about 31 feet deep. The unfinished exit shaft went up about 15 feet but did not break the surface. The tunnel averaged about 3 feet tall and 2½ feet wide, and was 627 feet long.