Border Wars

Border Patrol agents stop a pickup truck filled with people who have crossed illegally from Mexico in the opener of this documentary series following officers and agents of U.S. Customs and Border Protection (CBP). Also, a group of badly dehydrated border crossers are rescued in the scorching desert.

Undercover agents investigate a house in Nogales, Ariz., where illegal immigrants and human smugglers are believed to be living. Also, an elaborate tunnel used by smugglers, fugitives and illegal immigrants is found.

Five agents are outnumbered when they come across a group of armed drug mules in the desert. Later, a nervous woman tries crossing the border, but it appears that she's not who she claims.

Officer Hector Navarro apprehends a heroin smuggler at the Nogales, Ariz., port of entry. Meanwhile, a wanted man with a criminal past tries crossing through the Nogales pedestrian gate.

National Geographic goes inside the US-Mexico border with unprecedented access to the growing arsenal of high tech cameras, ground radar, and skilled trackers who are faced with the challenge of controlling the desert every day. A report on illegal immigration follows drug smugglers and job seekers as they risk their lives attempting to cross the Mexico-U.S. border. Also, a look inside the U.S. Border Patrol.