731m Tunnel
So will a wall really work if these are already in use?
Federal authorities, who uncovered the 731m tunnel on Wednesday, brought in a forensic team to look for fingerprints and DNA, and to sample the air and walls, so they could determine how long the tunnel had been in use and what it was used for, Mr Unzueta said.
The tunnel has cement walls and supporting planks, is no less than 1.2m tall and wide, and runs as far as 18m underground, Mr Unzueta said. It had lighting and ventilation, and a pumping system to drain groundwater.
The US entrance had a cement ramp with a washboard pattern for better footing. "We believe this tunnel is, in fact, the largest tunnel ever found on the Southwest border," he said.![]()
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