Welcome to a place that used to be a secret base for submarine repairing once and is a museum now.
The construction in the Balaclava bay is an underground protected complex engaged in repairing and protection of medium-sized diesel submarines. Construction of the object was launched in 1957 being over by 1961.
According to the preliminary project, the object had to consist of 4 dry docks and a dockyard where four medium-sized boats could be repaired simultaneously. Finally, only the dockyard and one dock were completed. A number of submarine shelters decreased, respectively.
Employees of the underground complex could repair submarines and then let them out through a special gateway right into the sea. The complex was also used as a bomb-shelter for one thousand people.
The main channel.
A submarine had to move from the Balaklava bay to the beginning of a channel from where it was removed with the help of robes and hemps.
The channel was 506 meters long, 6-12 meters wide and 6-8 meters deep. The submarine entered the dock, the gateway closed, water was evacuated and the submarine could be repaired.
The complex had medium anti-nuclear endurance. It could survive just a 100 kiloton nuclear weapon.
The channel and the docks were curved making maintenance of submarines easier.