TBM vs NATM

Two excellent short videos on how tunneling is accomplished. In case you ever wondered …

TBM (Tunnel Boring Machine)

https://youtu.be/qx_EjMlLgqY

 

NATM (New Austrian Tunneling Method)

https://youtu.be/GMFo1fN_Exk

 
Now … wasn’t that fascinating?

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