Tangadan Tunnel is a tunnel that was built during the Japanese occupation of the Philippines in World War II. It was used as a hideout and a supply route by the Japanese soldiers. It is located in the town of San Quintin in the province of Abra, Philippines.
The tunnel has a length of 40 meters and a width of 5 meters. It has two entrances, one on each end of the tunnel. The tunnel is made of concrete and steel, and has ventilation holes on the ceiling. The tunnel also has a small chamber that was used as a storage room by the Japanese.
The tunnel is now a historical landmark and a tourist attraction. It offers a glimpse into the history and heritage of Abra and the Philippines during World War II. The tunnel also has a museum that displays the artifacts and memorabilia of the war, such as guns, bullets, helmets, and uniforms.