The San Diego Union Tribune reports that someone dug a tunnel beneath the U.S.-Mexico border. Apparently our best and brightest immigration authorities are not sure exactly what the tunnel was being used for, but they have some interesting theories:

TIJUANA – Mexican authorities tipped off their U.S. counterparts this week to a potential tunnel being dug underneath the border fence near the Otay Mesa port of entry.

It was incomplete," said Lauren Mack, a spokeswoman with U.S. Immigration and Customs Enforcement. "It would have been big enough for a person to just scoot through."

A task force that includes the U.S. Border Patrol, U.S. Drug Enforcement Administration and Immigration and Customs Enforcement followed up on the tip, concluding that it may have been meant for people trying to enter the United States illegally.

No, you think?