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Tag: Seattle State Route 99 tunnel
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Before Bertha repairs begin, archaeologists will test soil for artifacts
Before workers in Seattle begin to dig a 12-story pit to make the necessary repairs to get the world’s largest tunnel boring machine running once again, they must step aside to allow archaeologists to search the soil for artifacts. Sixty vertical holes were drilled into the soil 48 feet above dormant Big Bertha, the tunnel-boring […]
March 25, 2014
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