emanuele menietti
@emenietti · Feb 17, 2017
this one doesn't need to stop and provides a continuous tunnelling mode, in some conditions herrenknecht.com/en/products/co… / @elonmusk
Elon Musk
@elonmusk
Yes, but only deep in solid rock, where the walls are self-supporting and concrete reinforcements arguably aren't needed
03:55 PM · February 17, 2017 · 0 views
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