Nogales, México

NOGALES, Mexico – This is a city of commerce, a bustling town leaning into the U.S.-Mexico border where billions of dollars of tomatoes and squash and peppers are shipped into the United States every year along with shiny Ford Fusions, computer electronics and parts for the aerospace industry.

Underneath this sunbaked city, another kind of product is crossing into the United States. Through a spider web of tunnels bored into a vast drainage system that connects Nogales, Mexico, to Nogales, Arizona, billions of dollars of marijuana and other drugs are being shipped to the U.S. market.