code/modules/security_levels/security_levels.dm 
| /decl/security_state/default | The default security state used on most space maps. |
|---|---|
| /decl/security_level/default | An abstract security level type that supports announcements on level change. |
| /decl/security_state/none | A security state used for maps that don't have security levels exposed to players. |
| /decl/security_level/none | A dummy security level with no effects. |