Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. building divisions
7. rooms and spaces
8. [rooms and spaces by function]
9. protective spaces
10. bomb shelters

Anotations

Scope note:

Shelters, typically underground or in caves, intended to provide reasonable protection against the radiation and fallout of atomic bombs, typically having thicker walls and other features beyond those required in shelters for protection against conventional bombs.