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

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.

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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/rXO0JLxCPd0/the-enormous-mission-to-rescue-the-worlds-largest-tunne-1615073650
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