The tunnel between Murodo and Daikanbo was originally dug to deliver building materials of the Kurobe Dam in 1971. The length of the tunnel is 3.7 kilometers.
The tunnel is very narrow. There is only one-way traffic in the tunnel. Buses pass each other at the middle of the tunnel, which is right under Mt. Oyama, the main peak of the Tateyama Mountain Range.
After a ten minute bus ride in a dark tunnel, you will see a spectacular view of the North Japan Alps from the Daikanbo Observation deck.
The mountain on the left side is Mt. Harinoki (Altitude: 2,821 meters), the right end is Mt. Akazawa (Altitude: 2,678 meters).
You will also see a ropeway to Kurobe-Daira, located at the bottom of Kurobe Gorge.
You would notice that Tateyama Ropeway does not have any steel towers to support ropes between Daikanbo and Kurobe-Daira. The reason is to avoid any potential damage from avalanches. This area has a lot of snow in winter and avalanches occur frequently.