USA. San Diego, California. 2006. Imperial Beach, Border Field State Park. At the Pacific Ocean, the wall that separates the US from Mexico is plastic coated steel track driven vertically into the sand where it extends into the Pacific Ocean. There are some gaps in the wall wide enough for humans to pass through. The beach is under 24 hour surveillance by parked Border Patrol vehicles, sensors and spotlights, as well as overhead helicopters. The increased surveillance has driven many of the migrants to attempt to cross through the mountains and deserts where many die of exposure and dehydration, are vulnerable to wild animals and vipers, or may be attacked by vigilante groups on the US side. Here, a camera pokes through to take a picture of the US from Mexico. The construction of the wall began in 1994 under President Clinton's Operation Gate Keeper.