National Geographic Society

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A fence crafted from an old military landing mat separates Tijuana from San Diego. The San Ysidro border crossing is the busiest in the world, with over 40 million people entering the U.S. through the port in 2005 alone.

Next Airing:

Go undercover with Customs and Border Protection officers as they attempt to expose a human smuggling ring, searching for both illegal immigrants and the smugglers who bring them in. Join the officers as they head out on all-terrain vehicles to the border's front line on a trip to track down suspected illegal immigrants traveling on foot. Finally, stand by as officers search a rental car at the vehicle port of entry and uncover a woman wedged inside the front seat of the car.