The architecture of the housing facilities is quite an interesting thing to look into. They’re pretty safe, other than like catastrophic tectonic activity as far as I know.
I think the more interesting part is the labelling of those sites. Well, the potential ideas to mark these areas as dangerous to dig/disturb. What I’ve seen is that it’s trying to mark them for the far future so that even if you don’t know the language, it’s (hopefully) obvious.