Anderson Cooper from CNN takes a tour through a sophisticated tunnel route discovered by law enforcement running under the Mexico-U.S. border for drug smuggling:

The tunnel, complete with an elevator, electricity and a ventilation system, extends from Tijuana, Mexico to Otay Mesa, Calif., in San Diego. The tunnel was discovered by Mexican law enforcement working with the San Diego Tunnel Task Force, which includes agents from Immigration and Customs Enforcement, the Drug Enforcement Agency and the U.S. Border Patrol.

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