Under the mountain there is an armoury, a channel, and a service, repair and equipment base for submarines. It had been built since 1957 until 1961 by military men, who were later accompanied by specialists in underground construction. It is also an anti-radiation shelter for 3000 people. The maximum width of the rocky ground is 126 meters. The channel has a length of 505 meters, a width of 6-8.5 meters...