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The article does not mention one interesting property: Reusability. The big machines are often left underground after the tunnel is finished. They drill their
by hasoleju 3y ago
The article does not mention one interesting property: Reusability.
The big machines are often left underground after the tunnel is finished. They drill their own grave right next to the main tunnel and then they stay there.
Usually big tunnels are drilled by starting at both ends and the two independent holes then connect in the middle of the mountain.