Fallout Shelter

Fallout shelters, also known as fallout bunkers or just bunkers, are enclosed subterranean spaces specifically designed to protect inhabitants from radioactive debris or fallout resulting from a nuclear detonation. Fallout shelters were primarily built during the Cold War; an old-world conflict that lead to the fall of humanity during the Nuclear War of 1993.

Details and Construction
Basic fallout shelters consisted of shields that reduce gamma ray exposure by a factor of 1000 and blast doors that absorb the shock wave from a nuclear blast, before returning to their natural shape. A well-made fallout shelter is waterproof, contains functioning thermal vents, and has some form of air filter. Civilian fallout shelters were often quite small, with only one or two rooms, while public or military shelters were much bigger and more technologically advanced; some even containing Faraday cages to prevent electromagnetic pulses from damaging electronics within.

Most shelters were built beneath tall buildings, while others were made beneath small houses in a sub-level below a concrete basement. This ensures extra protection from the blast, which could damage the door of a fallout shelter.