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Continue to ChatBreakthrough! Bertha TBM Completes Alaskan Way Viaduct Tunnel in Seattle https://geoprac.net/2017/04/breakthrough-bertha-tbm-completes-alaskan-way-viaduct-tunnel-in-seattle/
Breakthrough! Bertha TBM Completes Alaskan Way Viaduct Tunnel in Seattle https://geoprac.net/2017/04/breakthrough-bertha-tbm-completes-alaskan-way-viaduct-tunnel-in-seattle/