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Re:The Boring Company [video] by pjc50 on Saturday April 29, 2017 @05:51PM (#14228973)
I was thinking of the NATM failures: http://www.tunneltalk.com/images/laneCoveCollapse/Ref5-Heath...

(which were during construction, but happened in "finished" sections, I believe. NATM applies a single pass of shotcrete to the cut rock surface)

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