It was made by Hitachi Zosen Sakai Works in Osaka, Japan, and the machine's assembly was completed in Seattle in June 2013. Tunnel boring began on July 30, 2013, with the machine originally scheduled to complete the tunnel in December 2015.OverviewBertha was a 57.5-foot-diameter (17.5 m) built specifically for the 's (WSDOT) project in ,. .
The name Bertha, after Seattle's first female mayor, , was chosen by a panel (that included the Governor and Transportation Secretary) from 150 submissions from kindergarten through 12t.
[pdf] In this guide, I will show you a step-by-step process on how to make your very own homemade drilling rig. Whether you're drilling for water wells, oil, or just making holes for your DIY projects, this innovative rig will save you time, money, and give you the satisfaction of doing it yourself.
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