Video of an elaborate cross border drug smuggling tunnel discovered inside a warehouse in Otay Mesa, CA, near U.S. and Mexico border Millions of dollars of .\rbr\rbrThe passage connecting warehouses in San Diego and Tijuana, Mexico, was about 2400 feet long and 30 feet deep. It was lit, ventilated and equipped with a .\rbr\rbrFederal officials say a tip led to the discovery of an underground smuggling tunnel connecting a small town in Arizona to Mexico. (Feb. 25) Subscribe for more .\rbr\rbrMajor Drug Tunnel Found On U.S.-Mexico Border in California Major Drug Tunnel Found On U.S.-Mexico Border in California Major Drug Tunnel Found On .