Talk:Astronaut lairs/@comment-4635610-20111209012047/@comment-4501235-20111209035040

That is very interesting, I've never had the exact same thing happen, but there is a known bug where terrain will regenerated or new terrian will generate replacing the terrain that was there originally. If you haven't read the blogs Terrain regen bug or New Terrain Generation bug check them out. I mention those because one time when this happened to me, the new terrain had an astronaut's lair and the old one didn't. I've never come across a lair that is only partially built.