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So it's not exactly automotive, but it is a fascinating vehicle – and you'll excuse us if we don't make any puns about how boring it actually is. A portion of Seattle's Alaskan Way Viaduct is being replaced by a deep tunnel, and the machine purpose-built for the job is the world's largest tunnel boring machine (TBM), christened "Bertha." Built by Hitachi Zosen, the 300-foot-long doomsday machine is excavating a 57.5-foot-wide hole for a two-level highway with two lanes in each direction.

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