From azcentral.com:
A cross-border tunnel still under construction has been found in Nogales.
The tunnel was discovered Monday by Mexican police and Border Patrol agents from the Tucson sector, which includes Nogales.
The tunnel spanned from about 6 feet on the Mexican side of the border to about 44 feet into the U.S., said Border Patrol Agent Daniel Hernandez.
The tunnel, most likely the work of criminal organizations in order to smuggle drugs into the U.S., was not complete, Hernandez said.