Finding out the location	very hard
Access	hard
Safety	unsafe
Risk of being seen	low
General condition of the place	good
Traces of vandalism	none or very few
Good place for taking pictures?	very good
Did you see other people?	none or very few

Visit date    July 10 2021 at 20 hr
Visit duration    2 hours

The mysterious tunnel was built for scientific testing by a research institute. According to sources, it was built by Metrostroy itself, with a length of about 150-180 metres and a diameter of about 8-10 metres, just an underground island, but without an underground. On the ceiling there are concrete tunnels, ventilation shafts stretching along the sides, and on the sides there are tiles - like in the stations - but it looks like they are special, maybe even for high temperatures. There were no rails, instead of them, there were two entrances, probably for cables. In short it is large-scale and atmospheric. I dare to guess from scientific literature that it was a test facility for nuclear power installations, but it is not exact, I may be wrong of course, who knows what was in the minds of Soviet scientists, we have to go to the archives, look for participants and delve deep into the

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