December 1, 2011
View from inside a tunnel recently found in the northern border city of Tijuana, Mexico, Wednesday Nov. 30, 2011. A day earlier, the tunnel was discovered by U.S. authorities in San Diego's Otay Mesa area, the latest in a spate of secret passages found to smuggle drugs from Mexico. This tunnel is a 600-yard passage linking warehouses in San Diego and Tijuana and is equipped with lighting and ventilation.
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The secret passage linking warehouses in San Diego and Tijuana highlights an emerging seasonal trend. For three years, authorities have found sophisticated tunnels on the U.S.-Mexico border shortly before the winter holidays in what officials speculate is an attempt by drug smugglers to take advantage of Mexico's fall marijuana harvest.