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Bertha was a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle.

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Tunnels are certainly one of engineering's great achievements. Early construction projects relied on manual labor and took years to complete. That all changed with the invention of the tunnel boring machine (TBM), which is now used to build modern tunnels worldwide.

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