In the Petersburg suburb there is a very interesting location — the underground military decontamination facility remained from the time of the Cold War. There were rumours that this location had itself radioactive contamination. So once Mutabor and Lanivs decided to explore this place being armed with a radiometer. First they had met an old fire-point built before WWII and further upgraded (pic 1–7). Then they had found the main location, two-level underground facility, explored it and found out that the radioactive background everywhere was normal (pic 8–48).