EL PASO, Texas – Investigators said they have discovered an underground tunnel going from Ciudad Juarez ... you know, up and down, horizontal, drilling equipment. That’s mining equipment ...

Soldiers who called themselves 'tunnel rats' fought an underground war in Vietnam through an intricate maze of hardened ...

U.S. and Mexican forces worked together to shut down a cross-border tunnel used by smugglers to bring illicit cargo into the United States, authorities said.

Though dark and damp, the tunnels provide cover from the harsh ... even when no shelter or housing is available. Others said they go down to escape the unbearable weather. Triple digits are ...