U.S. authorities have discovered 20 tons of pot near a tunnel connecting warehouses on either side of California's border with Mexico.
U.S. Immigration and Customs Enforcement spokeswoman Lauren Mack says Wednesday that the tunnel ran 600 yards under the border near San Diego. It had lighting, ventilation and a rail system for sending carts of drugs into the United States.
Mack says the tunnel ended near California's Otay Mesa port of entry.
Officials have found 125 tunnels since they started recording them in the early 1990s. Of those, 75 have been found in the past four years, most along the California and Arizona borders with Mexico.