Massive new cross border drug tunnel shut down south of San Diego

The newly completed tunnel, connecting a warehouse in Tijuana, Mex., with a building in San Diego's Otay Mesa industrial park, stretches the length of nearly six football fields. The passageway – equipped with lighting, ventilation and an electric rail system – is the largest, most sophisticated tunnel uncovered along the southern border in two years. Investigators say the tunnel's zigzagging path suggests builders veered off course several times during its construction.