Dive into the depths of Kaiyama Underground Bunker, a hidden stronghold built by the Yokosuka Naval Air Corps during World War II. Partially open to the public, this site also hosts rare tours. Let’s delve deeper into this historical legacy. Contents Preserved history since 1944: Kaiyama Underground BunkerGuided Tour: Kaiyama Underground BunkerTour Course: Walking through … Continue reading Kaiyama Underground Bunker | YOKOSUKA