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US officials say they have discovered the longest smuggling tunnel ever found on the border with Mexico.
Stretching for 4,309ft (1,313m), the tunnel had a lift, rail track, drainage, and air ventilation systems, and high voltage electrical cables.
The passageway connected an industrial site in the Mexican city of Tijuana to the San Diego area in California.
There were no arrests made or drugs found. Authorities did not say who they suspected of being behind the tunnel.
But Mexico’s Sinaloa cartel, described by the US government as one of the largest drug-trafficking organizations in the world, operates in the area. Its founder and long-time leader, Joaquin “El Chapo” Guzman, is serving life in prison in the US.
The tunnel was discovered in August. Mexican officials identified its entrance and US investigators mapped it, before releasing the findings on Wednesday.
It has an average depth of 70ft (21m) below the surface, with the tunnel being 5.5ft high and 2ft wide, US Customs and Border Protection said. It was not clear how long it took to build it.
“The sophistication and length of this particular tunnel demonstrate the time-consuming efforts transnational criminal organizations will undertake to facilitate cross-border smuggling,” Cardell Morant, acting special agent in charge of Homeland Security Investigations in San Diego, said in a statement.
Several hundred sandbags were discovered blocking a suspected former exit of the tunnel in San Diego’s Otay Mesa industrial warehouse area, the statement added. The main tunnel had an incomplete offshoot.
More than a dozen sophisticated tunnels have been found on California’s border with Mexico since 2016. The second-longest tunnel in the US, found in San Diego in 2014, was 2,966ft long, the CBP said.
Recent US-Mexico border tunnels:
- August 2018: A 600ft tunnel stretched from a former KFC in the state of Arizona to Mexico
- April 2016: A sophisticated tunnel in San Diego was used to transport an “unprecedented cache” of cocaine and marijuana, according to officials
- March 2016: A tunnel ran from a restaurant in Mexico to a house in California
- August 2015: An unfinished tunnel with rails, lighting, and ventilation is found in Tijuana
US President Donald Trump has made building a border wall one of his key priorities, saying it is needed to tackle illegal immigration and drug trafficking. But officials say most drugs are smuggled through legal ports of entry, hidden in privately-owned vehicles or transporter lorries, mixed with other goods.
