The Nuclear Shelter is one of the five Modern Era decorations and can be build after researching Mechanized Artillery. When the Nuclear Shelter is polished, its output of happiness is doubled for 12 hours. Decoration does not need a road connection.
+68.75 per tile.
Your decoration can be polished to double the happiness provided to +550 for 12 hours.
On the main doors inscribed are the letters "101". This is most likely a reference to the Fallout game series where nuclear shelters dubbed "Vaults" and their gear-shaped external blast doors are a prominent relic of the retro-futuristic world. Vault 101 is where the protagonist of Fallout 3 grows up. This could also be a reference to the book 1984 by George Orwell, written and published 1948. 101 being the room of the condemned.
- The efficiency is calculated by the happiness it provides divided by the number of squares the building takes up in size.