U.S. officials uncover underground football tunnel between California and Mexico, including electricity, ventilation, rail system, reinforced walls The Guardian.

It was determined that the tunnel leads to the warehouse to the industrial zone on American soil.

The tunnel is located 800 meters from the Otay Mesa border crossing between Tijuana and San Diego.

After monitoring the house, which until recently was used as a "drug box", US agents began stopping vehicles near the warehouse. They found boxes full of cocaine.

799 kilograms of cocaine, 75 kilograms of methamphetamine, 1.6 kilograms of heroin from the stopped vehicles and the "box" were seized. Six people have been arrested.

Since 2006, US authorities have uncovered 15 innovative tunnels on the border with Mexico.