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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
Jorrit Reinders
on
Vertical Tunnels: Herrenknecht's Shaft Boring Machine (SBM) bores shafts as deep as 2 kilometres in hard rock
(
1497 days ago
): Allow me to say it: WOW What an engineering marvel...