Drug and human smugglers continue to go underground, in an effort to evade U.S. Border Patrol agents in the Tucson Sector.
On Friday, agents found another smuggling tunnel in Nogales -- just west of the Di Concini Port of Entry.
Agents say the tunnel was burrowed under the border, extending 50 feet into the U.S., and was cut into an established drainage system.
This is the 11th tunnel Tucson Sector agents have discovered since last October.
During the same time period a year ago, agents had found six clandestine tunnels.
