Just weeks after uncovering a drug smuggling tunnel some six football fields long, officials in San Diego have busted a second such passageway. The half-mile tunnel runs from a home in Tijuana to a San Diego warehouse—which happens to be located near the building that housed the entrance to the other tunnel found earlier this month. US Immigration and Customs Enforcement called the new find "sophisticated," reports Sign on San Diego. Officials arrested several suspects and seized an undetermined amount of marijuana contained in a tractor trailer; they believe there is more in the tunnel. Click here for more on the passage found earlier this month.