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An Inside Look at Drug Tunnels Along the U.S. Border

In the wake of the underground escape by drug lord "El Chapo," take a look inside a few of the many drug tunnels discovered in the U.S. and Mexico.
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Federal authorities shut down a 481-foot illicit drug tunnel in Nogales, the longest such tunnel ever discovered in the border city, following a multi-agency investigation by the Nogales Tunnel Task Force. U.S. Dept. of Homeland Security