How do you navigate underground?

4

4ainik2017-09-17 14:17:34

Geolocation

4ainik, 2017-09-17 14:17:34

Those. I mean how do you manage to dig subway tunnels with high accuracy from different sides and at the same time 2 shields meet? I suspect that GPS is useless in this case ...

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Alexander, 2017-09-17
@NeiroNx

inertial navigation

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