Drug tunnel found in Arizona under parking lot used by customs workers

TUCSON, Ariz. - An 85-foot drug tunnel that was strung with bare light bulbs and ended near a parking lot used by Customs Service employees was discovered underneath the Mexican border. <br> <br> The tunnel, found on Monday, is at least the ninth discovered in Nogales since 1995, and the second in the border city to run directly beneath the international boundary. <br> <br> No drugs were found inside the tunnel, which was reinforced with two-by-fours, Customs spokesman Roger Maier said. <br> <br> Investigators believe smugglers punched a hole through the asphalt and would pass narcotics up into a waiting vehicle, then seal the hole with an asphalt plug. <br> <br> The tunnel ran just below the asphalt surface of the parking lot. Rain may have weakened the structure because a security guard noticed a slight depression in the pavement over the weekend and saw a tiny hole that opened to a larger cavity, Maier said. <br> <br>