March 21 project update: Second piece of tunneling machine lifted to the surface
Seattle Tunnel Partners has successfully hoisted the second piece of the SR 99 tunneling machine to the surface for repairs. This evening crews lifted one of the machine's upper sections, which weighs less than 100 tons.
Two more pieces of the machine will be removed from the pit as part of STP’s repair plan, which this narrated video (links to YouTube) explains in detail. Up next, crews will lift the right side body section of the machine, which weighs approximately 90 tons. The final lift will bring to the surface Bertha’s massive cutterhead and main drive unit, which weigh a combined 2,000 tons.
You can track the action on our time-lapse camera and follow @BerthaDigsSR99 on Twitter for updates. We’ll also continue to post photos and videos as STP’s work progresses.