Bertha’s Tunnel Boring Machine Repairs to Begin
admin | Created: 22 May 2015 | Updated: 22 Feb 2018
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GEOSTRATA, 2015, May/June, 68 In March, Seattle Tunnel Partners began to hoist “Bertha” – the tunnel-boring machine (TBM) on the Alaskan Way Viaduct project – to the surface to begin...