The underground vault haikyo in the shadow of Mt. Fuji is one of the strangest abandoned structures I’ve yet explored. A double-doored double-walled walk-in safe with triple combination locks buried in a man-made mound in an unpopulated and obscure part of the Japanese countryside. Now its thick and weighty doors hang open and loose, and there’s nothing in the vault but for 5 odd logo/symbols on the wall, and no other clue as to its purpose but for the dedication in kanji on top of the dome- ‘in memory of our ancestors’. Imposing entry hall to the vault. I stumbled …