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 RÃo 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.
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