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Bertha

tunnel%20boring%20machine)">Bertha, once the world's largest tunnel boring machine, completes its 9,270 ft tunnel under Seattle, Washington, after four years of digging and a lengthy delay near the beginning of the project.

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  1. Bertha, once the world's largest tunnel boring machine, completes its {{convert|9,270|ft|m|adj=mid|-long}} tunnel under Seattle, Washington, after four years of digging and a lengthy delay near the beginning of the project.
  2. Bertha, once the world's largest tunnel boring machine, completes its 9,270|ft|m|adj=mid|-long tunnel under Seattle, Washington, after four years of digging and a lengthy delay near the beginning of the project.
  3. Bertha, once the world's largest tunnel boring machine, completes its 9,270 ft tunnel under Seattle, Washington, after four years of digging and a lengthy delay near the beginning of the project.

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