U.S. authorities have found a tunnel for cross-border drug smuggling, equipped with a railroad system and electricity, in a $ 25 million drug bust.

The “challenging” path consists of six football fields and runs from Tijuana in Mexico to San Diego, California.

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It occupies one-third of a mile, four feet deep in diameter, and about six storeys high.

Police say it was discovered Friday near the San Diego border in Otai Mesa, an area where more than a dozen other complex tunnels have been found.

As part of the investigation, they seized 1,762 pounds of cocaine, 165 pounds of methamentamine and 3.5 pounds of heroin.

In addition, six California residents between the ages of 31 and 55 have been charged in this regard.

The tunnel left the United States in an inconspicuous warehouse called Amistad Park.

It is unclear how long it lasted and how much medication passed through it.

Police found him after inspecting a house that was recently used for drug storage, and stopped the movement of vehicles that were there or in a warehouse near the border, finding boxes full of cocaine.

According to the federal prosecutor’s office, they found no other drugs in the property, but found a tunnel carved into the cement floor.

Authorities have discovered about 15 complex tunnels on the California-Mexico border since 2006, according to the Associated Press.

Border crossings date back to the early 1990s and were used mainly for smuggling multi-ton marijuana shipments.

The U.S. Drug Enforcement Administration said in 2020 that they are typically located in California and Arizona and are linked to the Mexican Sinaloa cartel.

Authorities refused to link the last tunnel to a specific cartel.

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