The Japanese bunker in the town of Bukittinggi was built by Indonesians under forced labor for the Japanese soldiers who occupied Indonesia from 1942 to 1945. This 1,470 meter long underground bunker is 40 meters below Ngarai Sianok (Sianok canyon). There are 21 tunnels in the bunker which were used to store ammunition, as residences, meeting rooms, the Romusha (forced labourer) dining room, kitchen, prison, hearing room, torture room, espionage room, ambush room, and the escape gate. Exploring this complex burrow of tunnels and caves is a real adventure.
You can see how these this place made an effective fortress. The tunnels are three meters in diameter and have walls so thick that sounds cannot be heard from the outside. The tunnels cover a vast area, nearly two hectares, and have six doors. One door is located in Panorama Park while others access Sianok village in the Ngarai Sianok ravine.