CRCHI World's Largest Diameter Vertical TBM for shaft boring
World's Largest Diameter Vertical Tunnel Boring Machine for shaft boring Made in China by CRCHI. http://en.crchi.com/art/2023/6/16/art_40592_4586039.htmlAlaskan Way Replacement Tunnel (SR99 tunnel( bored by Bertha produced by Hitachi Zosen)
Seattle City Council (WCC)
cover tunnel photo by: Matt Brown from London, England / CC BY
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