The Herrenknecht TBM (The Boring Machine) breaks through the 3200 meter long Belchen tunnel after 72 weeks
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@historyinmemes Brief animated clip (by Herrenknecht) of what a tunnel boring machine cutterhead looks like in action. I
@HommieYoung1 1830’s tunnel book
@HommieYoung1 @historyinmemes Now this too... x.com/SaltFlash/stat…
@HommieYoung1 @historyinmemes This is interesting