Engineering

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A place to geek out about engineering, fabrication, and design. All disciplines are welcome. Ask questions, share knowledge, show off projects you're proud of, and share interesting things you find.

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Be kind.
Generally stay on topic.
No homework questions.
No asking for advice on potentially dangerous jobs. Hire a professional. We don't want to be responsible when your deck collapses.

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Front view of Bertha, once the world's largest tunnel boring machine (www.thestructuralengineer.info)

submitted 1 year ago by [email protected] to c/[email protected]

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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.

Image source

Wikipedia link for more info