text: Similar projects have been undertaken in Finland, which requires all buildings with area over 600 m to have an NBC (nuclear-biological-chemical) shelter, and Norway, which requires all buildings with an area over 1000 m to have a shelter.
  The former Soviet Union and other Eastern Bloc countries often designed their underground mass-transit and subway tunnels to serve as bomb and fallout shelters in the event of an attack. Currently, the deepest subway line in the world is situated in St Petersburg in Russia, with an average depth of 60 meters, while the deepest subway station is Arsenalna in Kyiv, at 105.5 meters.
  Germany has protected shelters for 3% of its population, Austria for 30%, Finland for 70%, Sweden for 81%, and Switzerland for 114%.