The descent into Isabela’s caliginous and cavernous Ilagan Japanese Tunnel is a deep dive into history itself.
Measuring 40 meters in length and 3.66 meters in both height and width, the tunnel is the sole of the various documented tunnels in the locality that was restored, preserved, and developed into an eco-tourism attraction during the administration of Ilagan Mayor Josemarie Diaz, DMD.
These tunnels date back to Japan’s occupation of the Philippines, when such underground passages were built primarily for defensive purposes as the headquarters for Japanese soldiers.
Historians believe the tunnels doubled as an arsenal or armory of the Japanese Imperial Army during World War II. Here, they stored weaponry like machine guns, bombs and explosives, bullets, and various ammunition.
Beneath the surface, the Ilagan Japanese Tunnel hides several chambers or compartments.
These functioned as makeshift offices or quarters of Japanese soldiers, dungeons for prisoners-of-war, and presumably as a repository of treasure loots, such as replicas of the Golden Buddha, gold bullions, coins, diamonds, platinum, and other valuable items.
Authorities likewise discovered passageways, rooms, vintage armaments, and other artifacts inside the tunnel — further contributing to its historical significance as a base used by Japanese soldiers.
Visitors, however, are not allowed to pass a certain point that remains to be opened for the viewing public.
In fact, the entire scope and breadth of the Ilagan Japanese Tunnel itself are yet to be fully scaled and explored.
Locals even believe that the Ilagan Japanese Tunnel in Brgy. Santo Tomas served as a decoy to a bigger passage somewhere in Brgy. Camunatan. This theorized tunnel that can supposedly accommodate six-by-six army trucks remains undiscovered.
