Assertion: typical vault | /r/HasProperty | built in stable area
Facets:
value: geologically
type: DEGREE
value: deep underground
type: LOCATION
Source sentences:
text: A typical vault is built deep underground in a geologically stable area (typical choices include mountain ranges and remote areas away from population centers), but such shelters have also been built below the foundations of modern cities in order to survive the effects of a nuclear blast.