Authorities found an estimated 10,000 pounds of marijuana inside a trailer that led to the underground crevice, said Eileen Zeidler, a spokeswoman for the Drug Enforcement Administration.
A Border Patrol agent heard noise Monday from the 30-foot trailer parked 360 yards north of the border in the town of Tecate, agency spokesman James Jacques said.
When he peered inside, he saw a pistol-toting man disappear into a hole. The trailer was half-full of packages containing the marijuana.
The Border Patrol says it's unclear if the tunnel was completed. U.S. and Mexican authorities are investigating.
Authorities have discovered dozens of tunnels along the U.S.-Mexico border in recent years, with many clustered around San Diego and Nogales, Ariz.
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