Photo detail

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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Tease photo

Big border drug tunnel highlights seasonal trend

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.

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