Yoichi Shimatsu, through some of his investigative work on bicycle, has tracked one site also part of the greater Fukushima security site responsibility over the years since Mar2011. (side note) One can appreciate the bicycle exploration he suggests as I’ve also explored parts of the main Japanese Island on bicycle back in the early 90’s when I lived there. Some of those mountain pathways, paved or not, can be quite a challenge going upgrade, in the lowest gear (21) on a mountain bike, no less.
Anyway, he provides a video of his and a friends’ investigations, also, some radiation readings on site. It follows:
Yoichi Shimatsu - Tracking Fukushima's Nuclear Weapons Sites
There are several other things about that region, Fukushima, the plains, and mountains further west, that are being kept hushed up. One of them is the old, World War II Axis Powers [Japan and Nazi Germany] Nuclear Weapons Site behind or west of the shoreline site, as they’ve come to be known and has been stated by local elders (towards the end of the video clip). One of the sites entrances are still marked with war time nomenclature.
George Knapp the Suppressed Truth About Fukishima