Excavation of the 120-foot-deep pit that crews will use to repair Bertha, the SR 99 tunneling machine, is more than halfway done in this November 2014 photo. The white pipes are part of the system designed to keep groundwater out of the pit. Learn more about the Alaskan Way Viaduct Replacement Program at www.alaskanwayviaduct.org or follow Bertha, the SR 99 tunneling machine, on Twitter @BerthaDigsSR99.
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