U.S. federal authorities and Mexican officials seized more than one metric ton of cocaine after discovering a large underground smuggling tunnel this week [1].
The discovery marks a significant escalation in border narcotics trafficking, as it is the first operational tunnel uncovered in four years [1].
The raid took place on May 29, 2026, targeting a passage that ran from Tijuana, Mexico, to the basement of a commercial building in San Diego, California [1], [2]. Video of the tunnel was released on June 1 [3].
Investigators said the tunnel was approximately 600 meters long [1], though some reports list the length as 589 meters [3]. The structure reached a depth of 17 meters and had a height of 1.4 meters [1].
Authorities estimated the value of the seized cocaine at approximately ¥70 billion [1]. Four people have been indicted in connection with the operation [1].
The Southern District of California led the investigation into the facility, which was designed to move narcotics from Mexico into the U.S. for distribution [1], [2]. Since 1993, officials have discovered 99 such tunnels along the border [1].
“The discovery marks a significant escalation in border narcotics trafficking.”
The reappearance of a sophisticated, operational smuggling tunnel after a four-year hiatus suggests a shift in cartel tactics or an increase in the investment of infrastructure to bypass surface-level border security. The scale of the seizure—over one ton of cocaine—indicates that these underground routes remain a high-capacity threat to U.S. narcotics interdiction efforts.
