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People who like reply on Vertical Tunnels: Herrenknecht's Shaft Boring Machine (SBM) bores shafts as deep as 2 kilometres in hard rock

    Lutz Genscher
    Lutz Genscher on Vertical Tunnels: Herrenknecht's Shaft Boring Machine (SBM) bores shafts as deep as 2 kilometres in hard rock (): #Herrenknecht...

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    cover tunnel photo by: Matt Brown from London, England / CC BY

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