Federal authorities have dismantled what investigators describe as a sophisticated cross-border drug trafficking operation linking Tijuana, Mexico, to San Diego, California, seizing more than a ton of cocaine valued at over $45 million and arresting four men accused of using an underground tunnel to move narcotics into the United States.
The operation, announced by federal prosecutors in Southern California on June 1, marks one of the most significant tunnel-related drug seizures along the U.S.-Mexico border in recent months. Officials say the underground passage connected a commercial property in Tijuana to a warehouse known as Buy 4 Less in San Diego's Otay Mesa district, a strategic location near one of the busiest border crossings in North America.
According to court filings and law enforcement statements, the investigation unfolded over nearly six months. Agents assigned to the Homeland Security Investigations Tunnel Task Force monitored activity around the warehouse from December 2025 through May 2026 after identifying what authorities described as suspicious movements consistent with large-scale narcotics trafficking.
The investigation culminated in the arrests of:
- Gregorio Epifanio Hernandez Lopez of San Diego
- Brandon Escalante Sandoval of Mexico
- Jose Jimenez of San Diego
- Antonio Cortez of Mexico
Federal prosecutors said Lopez faces charges including Conspiracy to Use a Cross-Border Tunnel and Conspiracy to Import Controlled Substances. All four defendants have been charged with Conspiracy to Distribute Controlled Substances.
What distinguished the tunnel from many previously discovered smuggling routes was its level of engineering. Investigators said the underground corridor was equipped with lighting, ventilation systems, and an electronic transport mechanism capable of moving cargo between Mexico and the United States.
Officials described the infrastructure as evidence of a highly organized operation designed to move substantial quantities of narcotics while avoiding detection by border authorities.
The tunnel was uncovered through cooperation between U.S. law enforcement agencies and Mexico's Criminal Investigation Agency, part of the country's Security Cabinet. Mexican authorities executed related search warrants as part of investigations involving alleged firearms, explosives, and narcotics violations.
The seizure comes as U.S. authorities continue targeting drug trafficking organizations that increasingly rely on sophisticated underground networks to circumvent heightened border security measures. Federal officials believe such tunnels remain among the most effective methods used by cartels to move narcotics across the border without passing through official ports of entry.
Kevin Murphy, Acting Special Agent in Charge for Homeland Security Investigations San Diego, linked the operation to one of Mexico's most powerful criminal organizations.
"This investigation and seizure represent a significant blow to the Jalisco New Generation Cartel. The discovery and dismantlement of this sophisticated cross-border tunnel, along with the seizure of more than a ton of cocaine, underscore the commitment and collaboration of Homeland Security Investigations and our Homeland Security Task Force (HSTF) partners," Murphy said.
He added: "HSI Special Agents and task force members worked tirelessly to disrupt the flow of dangerous narcotics into our communities, and we remain steadfast in our mission to protect the public and keep our communities safe."
San Diego County Sheriff Kelly Martinez emphasized the importance of multi-agency coordination in combating transnational criminal organizations that operate across international boundaries.
"Law enforcement collaboration is the backbone of dismantling sophisticated transnational drug cartels, as these organisations rely on vast illicit supply chains spanning multiple jurisdictions," Martinez said.
She added that coordinated investigations help authorities disrupt trafficking routes, weaken criminal finances, and prevent cartels from exploiting differences between jurisdictions. "The Sheriff's Office is grateful for the partnerships, hard work, and dedication of everyone involved in this investigation, and we will continue to support our federal partners in cases that keep our communities safe," Martinez said.
