In the Soviet times the government of the country seriously believed in the threat of global thermonuclear war which might cause unprecedented destructions, raze countries to the ground.
With this in mind they were building numerous shelters of various types all over the country. This shelter cannot be call a standard one, its construction is not typical. The shelter belongs to one defence plant in Moscow.
Moscow has a lot of shelters. Most of them are in a poor condition. Best preserved can be found at plants, near research institutes or other state institutions built in the times of the USSR.
Total number of existing civil defence facilities in Moscow is a state secret.
Of course, they won't be very helpful if a war begins. Modern bombs and missiles will rapidly turn all these shelters into mass graves.