The tunnel entrance.
The layout of the grid like tunnel complex in one mountain. Other mountains have similar tunnels. About 500 meters can be explored on foot.
The tunnels were built by using Korean labor so there is a monument to the Koreans who died tunneling.
The tunel conecting to the entrance is quite low so one must wear a hard hat provided by the organisation operating the tunnels.
Steel supports and wood are used to help secure some sections and to prevent any accidents.
Other connecting tunnels are blocked off with wire mesh and strong gates.
The tunnels are lit sufficiently but in places are dark which gives a feeling of what it may have been like tunneling.
In the above photo you can see the end which is an access point to the outside world. Some of the tunnels have outside access.
One of the cross tunnels lit up for inspection.
The sunlight at the end can be seen. But the tunnel exploration turns left before that point and keeps going deep into the mountain.
Above, a mark in the rock from tunneling can be seen. And below, some drawings on the walls were found which were drawn by the Korean laborers.
The end of the tunnel open for exploration which goes much further into the mountain.
There are some peace cranes at the junction where the walk ends which are a shrine for peace.
The red section is about 500 meters in length. The above shows how extensive the system was supposed to be.
Looking back just before exiting the tunnels.
The small shed where the hard hats are stored for the visitors who want to explore the opened section of tunnel. The tunnels are a 15 - 25 minute walk from Matsushiro station. At the time of visiting the tunnels, they were free and I received a leaflet with information about them.