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Mexican authorities have uncovered a sophisticated underground tunnel near the U.S.-Mexico border that was equipped with lighting, ventilation and an electronic transport system, which they say may connect Tijuana to a street in San Diego.
Mexico's Attorney General's Office, known as the FGR, announced the discovery Saturday following a search warrant executed at a property in the Nueva Tijuana neighborhood of Tijuana, Baja California.
Authorities said the tunnel stretched approximately 265 meters, or about 870 feet, and reached a depth of roughly 6.3 meters, or 21 feet underground.
According to investigators, the tunnel contained operational infrastructure, including lighting and ventilation systems, as well as an electronic sliding mechanism designed to move items in both directions between Mexico and the U.S.
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The tunnel was discovered through intelligence work conducted by agents with the FGR's Criminal Investigation Agency in coordination with Mexico's Security Cabinet.
Officials said the search warrant was executed as part of an investigation into alleged violations of Mexico's firearms and explosives laws as well as drug-related offenses.
Authorities said they believe the property may have functioned as a storage, logistics and trafficking center for firearms, explosives and illicit drugs.
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Photos released by the FGR appear to show agents navigating the underground passageway, access points leading into the tunnel and evidence recovered during the operation.
Investigators said they recovered ammunition, suspected methamphetamine, suspected marijuana, cell phones and various documents from the property.
Images released by Mexican authorities also appear to show ventilation infrastructure inside the tunnel, underscoring what officials described as a sophisticated operation.
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The FGR said its investigation indicates the tunnel likely connects to a street in San Diego, though authorities have not publicly identified the location or confirmed whether the U.S. side of the tunnel has been located.
The tunnel discovery comes as U.S. authorities announced charges against four individuals accused of trafficking more than a ton of cocaine through a sophisticated cross-border tunnel stretching between Tijuana and San Diego.
According to federal prosecutors in San Diego, the tunnel extended approximately 1,933 feet, reached a depth of about 55 feet and was equipped with reinforced walls, electricity, ventilation systems and rail infrastructure.
Federal investigators said the tunnel connected Tijuana to a storefront in Otay Mesa known as "Buy 4 Less," where agents discovered a concealed exit point hidden beneath the floor of a storage room.
Authorities seized approximately 1,029 kilograms, or more than 2,269 pounds, of suspected cocaine during the investigation, an amount prosecutors estimated was worth roughly $45 million.
Homeland Security Investigations said the seizure dealt a significant blow to the Jalisco New Generation Cartel, one of Mexico's most powerful criminal organizations.
The investigation resulted in charges against four suspects accused of using the tunnel to move narcotics into the U.S.
Federal officials said the tunnel was discovered after months of surveillance that began in late 2025 and culminated in coordinated enforcement actions on May 29.
Officials described the discovery as a significant blow to criminal organizations that rely on underground smuggling routes to move narcotics and other contraband across the border.
"For these defendants, it wasn’t a light at the end of the tunnel. It was lights and sirens," U.S. Attorney Adam Gordon for the Southern District of California, said.
The evidence and property have been turned over to federal prosecutors in Baja California, who will continue the investigation.
