Bertha is officially gone.
Crews lifted the final pieces of the world’s largest tunneling machine from the State Route 99 disassembly pit near the Seattle Center Wednesday, the Washington state Department of Transportation said.
The two-mile tunnel project beneath Seattle started in July 2013, but crews stopped the machine that December for two years to investigate and troubleshoot drilling difficulties. The machine’s main bearing was found to be damaged; the cause is in dispute and is currently…