this post was submitted on 26 Jul 2023
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Engineering

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Bertha was custom built to dig the State Route 99 tunnel under Seattle. It dug under the city (off and on) from December 2013 to April 2017.

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[–] aessedai 4 points 11 months ago

Here's the world's biggest TBM.

Tuen Mun-Chek Lap Kok