The Kamioka mine is famous for its hardness of rock, that is Hida gneis. It provides much quieter and stabler environmet inside the mine compared with on the ground.


The following figure shows how to align tunnels in the mine. A new entrance wil be dug at nearer position to the road. The altitude of tunnels is higher than the Atotsu tunnel to avoid water flood. The scale of the tunnel is about 5m width and 5m hight. The rock is so hard that the blasting method is normally applied to make tunnels.



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