Front view of Bertha, once the world's largest tunnel boring machine

www.thestructuralengineer.info

Front view of Bertha, once the world's largest tunnel boring machine

www.thestructuralengineer.info

kersploosh@sh.itjust.worksM to

Engineering@sh.itjust.worksEnglish · 2 years ago

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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