Before revision: Europe 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.
After revision: Europe Sim2ilar projects have been undertaken in Finland, which requires all buildings with area over 600 m2 to have an NBC (nuclear-biological-chemical) shelter, and Norway, which requires all buildings with an area over 1000 m to have a shelter.