In this 2013 photo made with a fish-eye wide-angle lens, "Bertha," the massive tunnel-boring machine, is shown ready to begin drilling the tunnel to replace the Alaskan Way viaduct, a double deck highway along the downtown Seattle waterfront.
In this 2013 photo made with a fish-eye wide-angle lens, "Bertha," the massive tunnel-boring machine, is shown ready to begin drilling the tunnel to replace the Alaskan Way viaduct, a double deck highway along the downtown Seattle waterfront. Ted Warren AP file photo
In this 2013 photo made with a fish-eye wide-angle lens, "Bertha," the massive tunnel-boring machine, is shown ready to begin drilling the tunnel to replace the Alaskan Way viaduct, a double deck highway along the downtown Seattle waterfront. Ted Warren AP file photo