A tunnel that has been used for a year is used to smuggle migrants, weapons and cash across the U.S.-Mexico border.

Mark Anthony Holguin was sentenced to four years for leading a human smuggling operation from Mexico to the U.S.

Border Patrol uncovers a cross-border tunnel from Mexico to El Paso, equipped with lighting, ventilation, and wood supports, used for smuggling.

Several federal agents have reportedly found a sophisticated "narco tunnel" in El Paso, Texas that has reportedly allowed cartel members to smuggle drugs and even humans into the U.S. undetected by border officers.

U.S. Border Patrol agents have discovered a manmade tunnel that crosses the Texas-Mexico border. It was found in a storm drain and leads to Ciudad Juarez.