A large-scale drug smuggling tunnel that connects Tijuana to San Diego was discovered and disabled by U.S. Customs and Border Patrol agents this week, the agency reported.

CBP agents who were assigned to the San Diego area first discovered the tunnel while it was under construction. The exit point was set to be in a nearby warehouse in Otay Mesa, about 1,000 feet inside the U.S. border. The tunnel was shown to have an electrical system, ventilation, and a railway track for moving large quantities of narcotics.

“As we continue to strengthen the nation’s air, and maritime border security, it’s not surprising that foreign terrorist organizations would resort to underground routes,” said Jeffrey D. Stalnaker, acting chief patrol agent of the San Diego sector. “Disruption of narcotics smuggling tunnels is critical to protecting American lives. I’m grateful for the exceptional work of the tunnel team agents who placed themselves in danger, as well as the cooperation of our Mexican law enforcement partners.”

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