Secret Tunnels from Mexico to the US for Smuggling Drugs, Guns, People
Most recent yields 30 tons of marijuana. Some have electricity, even elevators.
Mexican soldiers hold a ladder for journalists to climb out of tunnel between San Diego and Tijuana, Mexico, Nov. 16, 2011. Approximately 17 tons of marijuana were discovered in a cross-border tunnel that appears to be one of the most significant drug smuggling passages found between the U.S.and Mexico. (David Maung/Bloomberg/ Getty Images)
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