Related Article: Bertha is a 57-foot-diameter (17.4 m) tunnel boring machine built specifically for the Washington State Department of Transportation's (WSDOT) Alaskan Way Viaduct replacement tunnel project in Seattle. It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013. The name Bertha, after Seattle's only female mayor, Bertha Knight Landes, was chosen by a panel (that included the Governor and Transportation Secretary) from submissions from kindergarten through 12th graders, who were asked to submit female names with Washington state heritage. Read More: https://en.wikipedia.org/wiki/Bertha_(tunnel_boring_machine)