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Bye-Bye to Bertha, the world’s largest tunneling machine
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Bertha is moving -- the tunnel boring machine will dig 20 feet to reach an access pit for repairs: http://kng5.tv/1AFSxvg Workers prepped for Bertha by chipping a circle into the access pit wall. | KING 5
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Bertha is moving -- the tunnel boring machine will dig 20 feet to reach a…
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Seattle's tunnel boring machine finishes digging a hole under the city
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'Bertha' resumes mining final 1,000 feet of SR 99 tunnel after alignment adjustments
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