Mexican authorities said Thursday they seized about 10 tons of marijuana in an elaborate tunnel with a rail car system that extended well into San Diego and was designed to smuggle drugs into the U.S. from Tijuana.
The discovery on Wednesday marks one of the longest and more sophisticated clandestine tunnels found on the U.S.-Mexico border, the Associated Press reports.
The passage was 9 feet deep and about 2,600 feet long — about three-quarters of that distance in Tijuana and the rest in San Diego. It was lit, ventilated, and built with metal beams to prevent collapse.