Dipnaysupuan Japanese Tunnel

Dipnaysupuan Japanese Tunnel is a World War II-era tunnel complex located in the Dipnaysupuan Hills in Basco, Batanes, Philippines. Constructed during the Japanese occupation of Batanes, it served as a shelter, bunker, and lookout for Japanese forces. The site consists of interconnected man-made tunnels and chambers carved into the hillside and is now a preserved historic attraction visited as part of Basco town tours.

Visitors can expect a hillside tunnel system with multiple interconnected passages, chambers and openings carved into rock and earth. The interior is narrow, low-ceilinged and dimly lit, requiring bending in places. Surroundings include grassy hills with views over Basco and the coastline. Exploration is on foot with a local guide, viewing the tunnel layout, ventilation openings and lookout points. The site is outdoors and best explored in daylight.