A Mexican man linked to one of the largest marijuana seizures in U.S. history has pleaded guilty to drug charges

Daniel Navarro entered his plea in federal court in San Diego. Prosecutors say that Navarro oversaw the transport of 50 tons of marijuana through two sophisticated cross-border underground tunnels into California. The tunnels and drug loads were discovered in November 2010. Navarro faces a maximum penalty of life in prison and a minimum sentence of 10 years.