USA. San Diego, California. 2006. Smuggler's Gulch. The wall, in densely populated areas, is equipped with sensors, spotlights, and parked Border Patrol vehicles which include four wheelers. The intense surveillance has driven many migrants to attempt to cross through mountains and desert where many die of exposure and dehydration, or may be attacked by vigilante groups on the US side. Here a border guard drives his four wheeler along the spot-lit wall at night.