Bertha breakthrough: Seattle’s giant tunnel boring machine pushes through wall into rescue pit
Bertha breakthrough: Seattle’s giant tunnel boring machine pushes thr…
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Watch Bertha, the world’s largest tunnel boring machine, emerge from beneath Seattle
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Bertha breaks through: World's largest boring machine completes tunnel under Seattle
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newatlas.com
This is what it looked like as Bertha, the world's largest tunnel boring machine, completed her 1.75-mile journey today in Seattle. Details, more video: via.q13fox.com/BUJi5 | FOX 13 Seattle
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RIP Bertha: Final piece of Seattle's giant tunneler removed from pit
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