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Old 12-19-2016, 11:19 AM
 
Location: Seattle
8,171 posts, read 8,301,458 times
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"It’s been a busy week deep beneath Seattle, as Bertha the tunneling machine keeps on trucking through Belltown. Two new videos from the Washington State Department of Transportation capture some of the amazing work that goes into digging a hole under a city and running a double-decker highway through it.

On Wednesday, Bertha passed 170 feet beneath the intersection of Third Avenue and Blanchard Street. In the eighth of 10 zones that make up the nearly 2-mile tunnel, the machine begins it’s eventual climb toward the surface.

Crews building the SR 99 tunnel installed the 1,000th ring out of 1,046 that will make up the tunnel’s outer wall. It’s a process that has gotten much speedier over time.

“We’re in a really good rhythm,” said ring-builder Cody Heck, who is featured in one new WSDOT video: 'We're in a good rhythm,' Seattle tunnel worker says, as new videos show Bertha's progress - GeekWire
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