Big Bertha – world’s largest tunnel boring machine – facing big Seattle challenge
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Big Bertha – world’s largest tunnel boring machine – facing big Seattl…
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Watch Bertha, the world’s largest tunnel boring machine, emerge from beneath Seattle
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Watch: As disassembly continues, time-lapse video gives look inside Bertha the Seattle tunnel machine
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A drones view of Bertha: World’s largest boring machine completes tunnel under Seattle
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Bertha passes 1-mile mark: Video shows how Seattle’s tunnel machine is steered beneath city
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Bertha breaks through: World's largest boring machine completes tunnel under Seattle
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How did we get here? A look back on Seattle’s tunnel machine Bertha
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A 360 video tour of Bertha and Seattle’s SR 99 tunnel
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RIP Bertha: Final piece of Seattle's giant tunneler removed from pit
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Bertha Could Complete Drilling Within A Few Days
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