Bertha breaks through: World's largest boring machine completes tunnel under Seattle
Bertha breaks through: World's largest boring machine complete…
Apr 5, 2017
newatlas.com
Watch Bertha, the world’s largest tunnel boring machine, emerge from beneath Seattle
Watch Bertha, the world’s largest tunnel boring machine, emerge fro…
Apr 4, 2017
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A drones view of Bertha: World’s largest boring machine completes tunnel under Seattle
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Apr 9, 2017
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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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