Lifting Bertha, the World's Largest Tunnel Boring Machine | 2014-01-22 | ENR

Alan Barnhart knew that it would have been, in his own words, "absolutely catastrophic" if his crews damaged even one part of the world's largest working tunnel-boring machine, a 7,000-ton, 57.5-ft-dia drill nicknamed Bertha, which was designed to bore out the new Alaskan Way Viaduct in Seattle. The

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