They built a fallout shelter in their backyard during the Cold War.
Они построили убежище от радиоактивных осадков на своем заднем дворе во время холодной войны.
Definitions
A fallout shelter is a structure designed to protect individuals from radioactive debris or fallout resulting from a nuclear explosion. These shelters are typically underground or reinforced to provide safety from radiation and other hazards associated with nuclear events.