The Sinaloa cartel's tunneling activity is heavily concentrated in the Tijuana area. Many of them have been found to stretch from Garita de Otay, an industrial area in the northern part of the city, to Otay Mesa, a neighborhood in San Diego that "consists of highways, strip malls, and a few hundred warehouses clustered near the border."
A Mexican soldier flashes his torchlight inside a tunnel in Tijuana, November 3, 2010. US border police have found a sophisticated drug smugglers' tunnel the length of six football fields linking Southern California with Mexico and arrested two people, authorities said.