From Google Maps
Rating: 4/5 (4 reviews)
It's not an easy place to get to. Go to the end of the street where Okumura Nursery School and Tatsumi Guest House are located, and climb up behind an old concrete building. You'll have to crawl to get there, so it's not possible to do it after it rains. A flashlight is essential, a pendant light or a head light would be even better. Wear work gloves, long sleeves and long pants, and non-slip shoes. You'll need stamina to see the inside of the shelter as well.
5階建ての建物の西側にある。沢から50m程度登ったら、 右側に2箇所の入り口がありました。 こちらは、入り口が斜面に沿ってあるので洞窟陣地が立体的な感じです。
I looked around the five-story building, but there were no directions and I realized I'd probably have to climb a steep slope, so I gave up.