Former secret military base in the town of Balaclava (Ukraine)
In the early fifties Joseph Stalin personally reviewed and personally endorsed the project construction in the Balaklava Bay one-of-a-kind underground plant to repair submarines.
The scale of this building can be seen, for example, by the fact that in the event of nuclear war in his underground harbor could hide an entire brigade of submarines, and several thousand people. The top-secret "object 825" could withstand a nuclear explosion of enormous power and included a dry dock management, command posts and the channel that allowed the submarine going into the plant from the Balaklava Bay, go directly to the open sea, and not only on the surface, but also submerged.
Abandoned objects of the world. Part 4.