Shelters There were four categories of shelter strength. All protected from contamination, category 1 and 2 structures protected from direct hit by aerial bomb, while category 3 and 4 structures protected only from falling rubble and indirect result of an attack (shrapnels, blast accompanying an explosion). Category 1 shelters were dedicated for central authorities and...

According to the assumptions of the Territorial Air Defence made in the second half of the 1950s, for employees and residents of newly constructed residential, administrative and commercial buildings in air-raid threatened cities, it was required to build category 4 (lowest) shelters. While designing the number of shelter spots, one had to consider the following...

In 1951, when the Territorial Air Defence was being organised, the threat of an atomic bomb attack was relatively low. Nuclear weapon was only in the hands of the United States (438 warheads) and the USSR (25 warheads), moreover the prime carrier of such weapon were aircrafts, whose reach was limited, and air defence allowed...