The Seattle Tunnel Partners (STP) has completed most of the repair and reassembly of its tunneling machine, Bertha, installing a spare main bearing encircled by a new bull gear. STP will lower the front end of it into the access pit along the Seattle waterfront once the main bearing’s rollers and cages are in place.Tunneling is scheduled to resume Nov. 23 and is estimated to take about a year to complete.STP and Bertha are responsible for digging a 2-mile-long tunnel beneath downtown Seattle to replace the SR 99 Alaskan Way Viaduct, a more than 60-year-old double-deck highway that sunk several
