Border Tunnel Discovered Between Tijuana and Otay Mesa Under Investigation for Possible Smuggling Use

Authorities in Mexico, working alongside U.S. law enforcement partners, have uncovered a large underground tunnel near the Tijuana–San Diego border that is believed to have been used for cross-border smuggling activities. The discovery was made during a coordinated operation in the Nueva Tijuana neighborhood on May 30, according to reporting from NBC7 San Diego.

Officials say the tunnel appears to have been engineered for the movement of goods and potentially illicit materials between Mexico and the United States, though investigations are ongoing and no final conclusions have been released.

Discovery

Law enforcement authorities located the tunnel while executing a search warrant in the Nueva Tijuana area. According to Mexico’s Attorney General’s Office, the structure is approximately 265 meters (about 869 feet) long and reaches a depth of around 6.3 meters (about 21 feet).

The tunnel is described as wood-lined and structurally reinforced, suggesting it was designed for repeated use over time rather than temporary access.

Structure

Video obtained by NBC News shows the tunnel containing installed lighting and ventilation systems, indicating a level of construction intended to support extended activity underground.

Investigators also reported the presence of a sliding mechanism within the tunnel, which appears to have been used to move individuals or cargo more efficiently through the passage.

At this stage, U.S. authorities have not confirmed where the tunnel exits on the San Diego side, or whether a full cross-border connection has been verified.

Law Enforcement Response

Homeland Security Investigations (HSI) in San Diego, working with the Homeland Security Task Force (HSTF), confirmed they are involved in a criminal enforcement operation connected to the tunnel discovery.

Officials stated that details remain limited due to the active nature of the investigation and concerns about operational security.

Mexican Navy personnel participated in the initial raid and assisted in securing the site during the search operation.

Seized Materials

During the raid, authorities reportedly recovered several items from the site, including ammunition, multiple cell phones, bank cards, a DVR device, and a quantity of methamphetamine doses.

Officials have not publicly identified any suspects in connection with the materials recovered, and it remains unclear whether arrests have been made directly linked to the tunnel itself.

Possible Purpose

Mexico’s Attorney General’s Office stated that the tunnel is believed to have been used for the trafficking of drugs, weapons, explosives, and other contraband across the border into the United States.

Such tunnels have historically been discovered in the border region and are typically associated with organized smuggling operations due to the scale and engineering required to construct them.

Investigation

Authorities on both sides of the border are continuing to assess the structure and determine its full extent, including whether it connects directly to a facility or property in San Diego County.

U.S. officials have not confirmed the tunnel’s exit point or disclosed whether additional search warrants are being executed in connection with the discovery.

Investigators are expected to continue analyzing materials recovered from the site, as well as any surveillance or intelligence that may help identify those responsible for its construction and use.

The investigation remains active as law enforcement agencies work to determine the tunnel’s full operational scope and any links to broader trafficking networks.

FAQs