A tunnel stretching from Arizona to Mexico has been called the 'most sophisticated tunnel in US history' by authorities.
The tunnel, which was incomplete but was intended for smuggling, ran from San Luis in Arizona to a Mexican neighbourhood, and featured a water line, electrical wiring, ventilation and a rail system.
Carl E. Landrum, acting chief patrol agent with the Border Patrol's Yuma Sector told the Associated Press: "This appears to be the most sophisticated tunnel in US history, and certainly the most sophisticated I've seen in my career.
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"We will continue to work closely with our partners - Homeland Security Investigations (HSI) and State and local agencies to provide the best National Security possible."
Homeland Security Investigations found the tunnel at the end of last month.
According to federal agents, a camera was sent 25ft down after a sinkhole was discovered in the area of a tunnel investigation. Photos caught by that camera show the 3ft wide and 4ft high tunnel system.
Scott Brown, special agent in charge of Homeland Security Investigations in Phoenix, told KOLD: "Homeland Security Investigations and our esteemed law enforcement partners swiftly and effectively worked together to uncover and dismantle a cross-border tunnel for smuggling purposes into the United States.
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"Despite the international pandemic, HSI and our law enforcement colleagues remain resilient and committed to pursue dangerous criminal trans-border smuggling activities along the southwest border."
Back in January, officials in US announced they'd found the longest ever US/Mexico smuggling tunnel, stretching from more than three quarters of a mile from an industrial unit in Tijuana on the Mexican side, right the way through to San Diego, California.
Similarly to the one above, this 5.5ft high tunnel also featured a rail system, ventilation and a drainage system - it even had its own lift at the entrance.
Lance LeNoir, a Border Patrol operations supervisor, said that this tunnel has 'blown past' the previous record, a 2,966-feet-long tunnel found in San Diego in 2014.
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He added: "We never really thought they [the perpetrators] had the moxie to go that far. They continue to surprise me."
And it looks like they'll be continuing to do so if this most recent discovery is anything to go by.
Featured Image Credit: PA