What Lies Beneath

When Supervisory Border Patrol Agent Thomas Pittman began investigating the drainage systems beneath Nogales, Ariz., 20 years ago, he discovered an underground Wild West."The drainage tunnels were wide open and people were just flooding through them," Pittman says. "Back then the drains had gates [along the channel between Nogales and Mexico] that were made out of simple landing mat and the illegals would just break them open with no problem and make their way through."The Border Patrol installe