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orig bertha tunnel machine seattle largest cm_00000530
orig bertha tunnel machine seattle largest cm_00000530

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    World's largest tunneling machine still stuck

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World's largest tunneling machine still stuck

CNN's Thom Patterson explains how engineers plan on getting Bertha, the world's largest tunnel machine, digging again in Seattle.

World's largest tunneling machine still stuck

CNN's Thom Patterson explains how engineers plan on getting Bertha, the world's largest tunnel machine, digging again in Seattle.