ICE uncovers 400-yard border tunnel, net 1 ton of marijuana

This photo provided by U.S. Immigration and Customs Enforcement shows an investigator Wednesday, March 23, 2016, photographing the terminus of a tunnel at a newly-built home in Calexico, Calif., that runs the length of four football fields to a restaurant in Mexicali, Mexico. An investigation netted more than a ton of marijuana and resulted in multiple arrests. It was the 12th completed secret passage that U.S. authorities have discovered along Californias border with Mexico since 2006.(U.S. Immigration and Customs Enforcement via AP)

This photo provided by U.S. Immigration and Customs Enforcement shows an investigator Wednesday, March 23, 2016, peering into a tunnel at a newly-built home in Calexico, Calif., that runs the length of four football fields to a restaurant in Mexicali, Mexico. An investigation netted more than a ton of marijuana and resulted in mulitple arrests. It was the 12th completed secret passage that U.S. authorities have discovered along Californias border with Mexico since 2006. (U.S. Immigration and Customs Enforcement via AP) MANDATORY CREDIT

This photo provided by the U.S. Attorney's Office for the Southern District of California shows the entry point of of a tunnel at a restaurant in Mexicali, Mexico, that runs the length of four football fields to a newly-built home in Calexico, Calif. An investigation netted more than a ton of marijuana and resulted in multiple arrests. It was the 12th completed secret passage that U.S. authorities have discovered along Californias border with Mexico since 2006.(U.S. Attorney's Office for the Southern District of California via AP) MANDATORY CREDIT

This photo provided by the U.S. Attorney's Office for the Southern District of California shows a plug that closed the entry point of of a tunnel at a restaurant in Mexicali, Mexico, that runs the length of four football fields to a newly-built home in Calexico, Calif. An investigation netted more than a ton of marijuana and resulted in multiple arrests. It was the 12th completed secret passage that U.S. authorities have discovered along Californias border with Mexico since 2006. (U.S. Attorney's Office for the Southern District of California via AP) MANDATORY CREDIT

This photo provided by the U.S. Attorney's Office for the Southern District of California shows a tunnel at a newly-built home in Calexico, Calif., that runs the length of four football fields to a restaurant in Mexicali, Mexico. An investigation netted more than a ton of marijuana and resulted in multiple arrests. It was the 12th completed secret passage that U.S. authorities have discovered along Californias border with Mexico since 2006.(U.S. Attorney's Office for the Southern District of California via AP) MANDATORY CREDIT