For more than a century, a hidden city has been sitting right underneath Los Angeles — a vast network of now-abandoned ...

Authorities uncover a 265-meter underground tunnel near the U.S.-Mexico border equipped with lighting, ventilation and an electronic transport system.

Beneath the streets of Paris lies one of the largest underground labyrinths on Earth - more than 300 kilometers of tunnels ...

Tunnels have long been used as a method to smuggle drugs across the border. 99 subterranean passages have been discovered in the Southern District of California since 1993, according to the Justice ...

Underneath an Otay Mesa Buy 4 Less lay a nearly 2,000-foot-long, 55-foot-deep tunnel used to smuggle cocaine from Mexico to California, prosecutors say.

Cops on both sides of the US-Mexico border are investigating a sprawling underground passage uncovered in the Tijuana area ...

Federal agents uncovered a cross-border tunnel and seized more than a ton of cocaine worth an estimated $45 million. Here's ...

Mexican authorities say it was used as a storage, logistics, and trafficking center for weapons, explosives and illegal drugs ...

Authorities said they found a "sophisticated" cross-border tunnel under a fake store in San Diego used to smuggle drugs from Mexico after a monthslong Homeland Security investigation. Four suspects ...

Scientists found a hidden steel tunnel with sound waves, opening a new way to inspect roads and buried infrastructure.

Retired steelworker Tom Wells documented Chicago’s 60 miles of freight train tunnels under the city—it was just a matter of ...