Authorities discover 30 tons of marijuana, border tunnel Authorities discover 30 tons of marijuana, border tunnel - CNN.com November 3, 2010 On Wednesday a Special U.S. border tunnel task forces have found a 600 yard tunnel from a warehouse in Tijuana to a warehouse in San Diego. ICE, U.S. Drug Enforcement Administration and the Border Patrol say, four tons of marijuana was found in the Tijuana warehouse and 26 tons were found in the San Diego warehouse. An investigation is being done to find out who owns the warehouses. The tunnel had a rail system, lighting and a ventilation system. They usually use rail cars to transport their drugs through the tunnel into America. The tunnels are also, used to bring human cargo in to the states. In October 105 tons were confiscated by Mexican police headed for America. The U.S. government started keeping track of the smuggling tunnels in the 90s. Since then 124 tunnels have been found on the Mexican border and one on the Canadian border. Most tunnels are found in CA. and AZ. There have been 75 tunnels discovered on the Mexican border since 2006. One tunnel was as long as 7 football fields it was also, a warehouse to warehouse tunnel. The smugglers take their trucking inside the warehouses close the doors and then send their cargo through the tunnel on the American side. The cargo emerges inside a warehouse on the American side and then is loaded up inside the building, then doors open and its on its way to an American destination. The Special Task Force was created after 9/11 for security on the border. They send in robots into the tunnels before agents go down. The Agents have special underground mining training and have ground-penetrating technology to detect tunnels which is used by the military.