Mexico: Drug lord escape tunnel was deep and 'high-tech'The kind of tunnel that led Mexico's most powerful drug lord to freedom would have been more than a year in planning. The entrance would have to be in a place beyond the view of security cameras at Mexico's toughest prison. As authorities hunted Monday for any sign of Mexico's most powerful drug lord, it was clear that Joaquin "El Chapo" Guzman's escape must have involved inside help on a grand scale.

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