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. Bertha has only recently arrived at the Port of Seattle and is still waiting to get off the cargo ship she rode in on.
Autoblog , This is how a tunnel boring machine will burrow a viaduct under Seattle, This is how a tunnel boring machine will burrow a viaduct under Seattle
