Naval museum complex Balaklava is an underground submarine base in Balaklava, Crimea. It was a top-secret military facility during the Cold War, located in Balaklava Bay.
Today it serves as a museum and also houses a museum about the Crimean War.
Wikipedia https://en.wikipedia.org/wiki/Naval_museum_complex_Balaklava
Official Website http://muzey-sevastopol.com/
Phone +79788891056
Coordinates 44°30'3.755" N 33°35'47.343" E