Basic Shelter
Shelter, as in fallout shelter is a small enclosed space specially designed to protect occupants from radioactive debris or fallout resulting from a nuclear explosion.
Many such shelters were constructed as civil defense measures during the Cold War. These are your basic types of shelter for the year 1961.
Big Steel pipe fallout shelter in the backyard under three feet of earth.
Above ground double-walled bunker style Fallout Shelter.
A simple fallout shelter in your basement built with concrete blocks.