More From Big Bertha SR-99
Posted by Wayne Grayson on Jun 18, 2014
The largest tunnel-boring machine in the world needs a bit of reinforcement against the "wet and abrasive soils" deep below ...
Posted by Wayne Grayson on May 13, 2014
Just because Big Bertha is down for nearly a year, that doesn't mean work around the world's largest tunnel boring ...
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