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
geekwire.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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This is what it looked like as Bertha, the world's largest tunnel boring …
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