A San Diego Homeland Security Investigation led to the discovery of a cross border underground tunnel which has resulted in the arrest of six people for trafficking 1,762 pounds of cocaine.

The subterranean passageway is approximately 1,744 feet long and leads from Tijuana, Mexico, to an Otay Mesa, California, warehouse, according to a press release by U.S. Immigration and Customs Enforcement. The tunnel was about 61 feet deep and featured reinforced walls, a rail system, electricity and a ventilation system.

“There is no more light at the end of this narco-tunnel,” U.S. Attorney, Randy Grossman, said in the release. “We will take down every subterranean smuggling route we find to keep illicit drugs from reaching our streets and destroying our families and communities.”

Since 1993, 90 subterranean passages have been discovered in the Southern District of California and 27 of them have been considered sophisticated, according to the release.

“The San Diego law enforcement community has multiple investigative task forces that highly prioritize tunnel detection- exemplified by this tunnel discovery by the Homeland Security Investigations (HSI) San Diego-led Costa Pacifico Money Laundering Task Force,” HSI San Diego Special Agent in Charge, Chad Plantz, said in the release.

The defendants include Mario Jaramillo of Huntington Beach, California; Adrian Enriquez of Perris, California; Juan Cruz of San Ysidro; and Vanessa Ramirez, Luz de Luna Olmos, and Manuel Perez of San Diego, according to the release. All have been charged with cocaine trafficking.

“The San Diego law enforcement community throughout the years has consistently shown its ability to detect and remediate tunnels while bringing those responsible to justice,” Plantz said.

Authorities also discovered 164 pounds of methamphetamine and 3.5 pounds of heroin; the release stated. Olmos and Ramirez face additional charges of methamphetamine and heroin trafficking.