Congressman Duncan Hunter became a major proponent of border fencing in the San Diego sector; surplus military landing mats were obtained to use as an initial border fence.
Stadium lighting, ground sensors and infra-red cameras were also placed in the area.
 Eventually the primitive landing mat fence was replaced with a modern triple fence line that begins over one hundred yards into the Pacific Ocean at Imperial Beach, CA and ends more than 13 miles (19 km) inland on Otay Mesa where the mountains begin.
Congressman Duncan Hunter became a major proponent of border fencing in the San Diego sector; surplus military landing mats were obtained to use as an initial border fence. Stadium lighting, ground sensors and infra-red cameras were also placed in the area.  Eventually the primitive landing mat fence was replaced with a modern triple fence line that begins over one hundred yards into the Pacific Ocean at Imperial Beach, CA and ends more than 13 miles (19 km) inland on Otay Mesa where the mountains begin.
United States Border Patrol