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SR99 TBM makes breakthrough
06 April, 2017
US – A year ago, SR 99 tunnel crews were about to face their biggest challenge: a trip beneath the Alaskan Way Viaduct they were working to replace. On April 4, with the viaduct and more than 9,270ft of new tunnel safely behind them, there was nothing left to face but daylight as the SR 99 TBM broke through near Seattle Center.
