NEW : Authorities describe a `` very sophisticated '' drug smuggling tunnel . The tunnels are located in the mountains of southern Afghanistan and run for hundreds of miles from Pakistan to Afghanistan. The tunnel was between a Tijuana eat-in kitchen and two San Diego warehouses . After removing a 2-foot by 4-foot piece of flooring in that house , smugglers could head 80 feet down a cinder-block-lined stretch into the tunnel . NEW : Two people have been arrested in the United States , and at least seven in Mexico . The tunnel is in the same area where agents found another this month .
NEW : Authorities describe a `` very sophisticated '' drug smuggling tunnel . The tunnels are located in the mountains of southern Afghanistan and run for hundreds of miles from Pakistan to Afghanistan. The tunnel was between a Tijuana eat-in kitchen and two San Diego warehouses . NEW : Two people have been arrested in the United States , and at least seven in Mexico . The tunnel is in the same area where agents found another this month .