In November, U.S. authorities discovered two underground tunnels intended for drug-trafficking between Tijuana and San Diego. The unusually sophisticated tunnels boasted a rail system and working lighting and ventilation. Some 30 tons of marijuana were seized in the tunnel by authorities last month. What do the tunnels look like first-hand?
BBC journalist Rajesh Mirchandani took a tour of one of the tunnels and describes what he saw.
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