In the early Showa era, the residents dug in Zurashashi, the longest hand digging tunnel in Japan with a total length of 877 m (How to Tunnel).
It is a valuable civil engineering heritage that will convey the history of the great energy and the struggle of the predecessors such as the traces of Zurhashi that still remains.
In 2006, it was selected as a civil engineering heritage by the Japan Society of Civil Engineers.
Currently, only the entrance of the Yamakoshi area side can see the inside of the tunnel.
(From the Yamakoshi Official Website)