'Most sophisticated' border tunnel in US history

An incomplete tunnel found stretching from Mexico to Arizona appears to be "the most sophisticated tunnel in U.S. history," authorities said.

The tunnel intended for smuggling ran from a neighborhood in San Luis Río Colorado, Mexico, to San Luis, Arizona, where it stopped short of reaching the surface. It was built in an area that's not conducive to tunnels because of the terrain, and it had a ventilation system, water lines, electrical wiring, a rail system and extensive reinforcement, federal officials say.

"What makes this one unique is that the terrain in Yuma is very hard... the sand is very loose, and most of them end up caving. So the fact that the material was very well built and it had ventilation, it had water, it had a rail system with walls, roof, floor, electrical, makes this one a very unique type of tunnel," said Angel Ortiz, assistant special agent in charge for Homeland Security Investigations in Yuma. HSI is a division of U.S. Immigration and Customs Enforcement.

READ MORE: https://abc7.com/border-tunnel-appears-to-be-most-sophisticated-in-us-history/6360163/

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