Authorities discovered a tunnel near the Tijuana-San Diego border, sparking an investigation.

The nearly 1,000-foot-long tunnel is believed to be used for smuggling drugs and explosives into the United States.

Mexican federal authorities found the tunnel in the Nueva Tijuana neighborhood during a raid, with support from the Mexican Navy.

The tunnel reportedly led to Otay Mesa, California.

Watch below:

ALERT: Nearly 1000-foot-long tunnel uncovered is believed to be used for smuggling explosives and drugs into the US.

Mexican authorities and the Mexican Navy conducted a search warrant in Nuevo Tijuana for "violations of the Federal Law on Firearms and Explosives and the… pic.twitter.com/6JgAfnE6im

— E X X ➠A L E R T S (@ExxAlerts) June 1, 2026

NBC 7 San Diego shared further:

During their search, officials seized four cartridges, three cell phones, bank cards, a DVR device, and 24 doses of methamphetamine, among other items, the Mexican Navy said.

While searching the property authorities found a wooden tunnel believed to be headed toward the U.S. border.

Based on the evidence seized during the search warrant, Mexico’s Attorney General’s Office said the property likely functioned as a hub for storage and trafficking of weapons, explosives and illicit substances.

The evidence and property have now been turned over to the Federal Public Prosecutor’s Office, which will continue the investigation in accordance with the law.

“Special Agents with Homeland Security Investigations (HSI) in San Diego, in coordination with our Homeland Security Task Force (HSTF) partners, are conducting a criminal enforcement operation involving a cross-border subterranean tunnel in Otay Mesa, CA. To protect the integrity of the ongoing investigation and ensure the safety of all involved, we are unable provide additional details at this time,” a Homeland Security Investigations spokesperson said in a statement to the outlet.

Mexico cops discover massive tunnel into America from Tijuana – and it was hidden in plain sight https://t.co/ZTevhUp28q pic.twitter.com/qjrTy7TuXI

— New York Post (@nypost) June 1, 2026

More from the New York Post:

Officials have not yet disclosed where the tunnel may emerge on the US side of the border, how long it may have been in operation, or whether any arrests have been made in connection with the discovery.

Cross-border tunnels have long been used by transnational criminal organizations to move drugs, cash and other contraband between Mexico and the United States while avoiding heavily monitored ports of entry and border security infrastructure.