More From Washington State Route 99 tunnel
Posted by Wayne Grayson on Jul 31, 2014
Crews in Seattle are now expected to finish digging a 12-story pit to reach stalled tunnel-boring machine Big Bertha one ...
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 Jan 31, 2014
After nearly two months of downtime caused by a steel pipe stuck in her teeth, Big Bertha, the world's largest ...
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