Inside underground El Paso storm drain system Border Patrol says cartels exploit to smuggle illegal migrants

Hidden beneath the streets of El Paso lies what U.S. Border Patrol agents describe as "a city underneath our city," a sprawling network of storm drains built for flood control that authorities say Mexican cartels continue exploiting to smuggle illegal migrants from Mexico into the United States.

Fox News was granted rare, exclusive access underground with the El Paso Sector’s elite Confined Space Entry Team (CSET), joining agents as they navigated the dangerous maze of tunnels where Border...