Upon leaving the inner part of the cave, fell out of the map for seemingly no reason, while getting the ATV missing warning. Fell for a few minutes before pressing "." to teleport to base; had Autosave on so the game saved in this state. ALL objects are gone from the ENTIRE map, nothing remained, including all of the servers, main room consoles, meat from the meat room in the basement, event related objects, etc. All of the trash and grime, as well as chunks of meat on the roof, got reset. Later decided to check with debug camera if there's anything beneath the map(to see if maybe everything fell under the map like I did), instead found the purple crystal from the inner cave which isn't present on other savefiles. So I assume that the game saved the objects from the inner cave and then imported them onto the main location, causing everything to disappear(maybe not? I don't know really).
So uh, is there a way to fix this? It's my main savefile so I really hope there's some way. Doubt it, but I will cope until the end.