#Feds discover ‘most sophisticated tunnel in history’ along US-Mexico border

A more than 1,300-foot underground passageway stretching from Arizona to Mexico was recently discovered — with the feds calling it “the most sophisticated tunnel in US history.”

The unfinished tunnel — which ran from San Luis, Arizona, to neighboring San Luis Rio Colorado in Mexico — had a ventilation system, water lines, electrical wiring, a rail system and extensive reinforcement, Immigration and Customs Enforcement said Thursday.

“This appears to be the most sophisticated tunnel in U.S. history, and certainly the most sophisticated I’ve seen in my career,” said Carl E. Landrum, acting chief patrol agent with the Border Patrol’s Yuma Sector.

Feds unearthed the tunnel after finding a sinkhole along the US-Mexico border in mid-July.

Border Patrol agents in Yuma drilled near the site of the sinkhole and turned up pieces of wood and water hoses underground — as well as a mysterious void.

“A specialized camera was deployed 25 feet underground to investigate the gap revealing the cross-border tunnel,” ICE said.

Photos show that the tunnel measures 3 feet wide and 4 feet high. There was no access from it to the surface in the US — indicating that it was incomplete at the time it was found.