U.S. authorities have uncovered a nearly 2,000-foot-long cross-border tunnel equipped with ventilation and lighting. The sophisticated tunnel allegedly moved millions of dollars in drugs from Tijuana, Mexico, to a San Diego storefront.

<img alt="Cross-border tunnel." height="349" src="https://i.cbc.ca/ais/ff09f69a-fc47-419b-9c47-dd6b96553cb9,1780607500622/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C213%2C4096%2C2304%29%3BResize%3D%28620%29" title="Cross-border tunnel." width="620" /><p>Andrew Chang breaks down the U.S. Department of Homeland Security's investigation of a nearly 2,000-foot-long tunnel — complete with ventilation, lighting and an electric rail system — which allegedly carried millions of dollars' worth of dru...