The Enormous Mission to Rescue the World’s Largest Tunneling Machine

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Big Bertha was all set to dig a nearly two-mile tunnel in Seattle, but just 1, 000 feet into her journey she hit a mysterious object that halted her progress. Now, crews are beginning the process of rescuing her, in what could be the world’s largest recovery mission . Read more…

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The Enormous Mission to Rescue the World’s Largest Tunneling Machine

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