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A Homeland Security Special Agent crawls through a drug tunnel at a warehouse near the U.S.-Mexico border in 2010.
A Homeland Security Special Agent crawls through a drug tunnel at a warehouse near the U.S.-Mexico border in 2010.

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    CNN tours newly discovered drug tunnel

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CNN tours newly discovered drug tunnel

Miguel Marquez tours a drug tunnel dug between Tijuana and San Diego that contained both lights and ventilation.

CNN tours newly discovered drug tunnel

Miguel Marquez tours a drug tunnel dug between Tijuana and San Diego that contained both lights and ventilation.