Latest version. Message: "Alien bombs has damaged our base <Name of base>". Ok, dismantled all buildings except air lock. The messages keeps pops up periodically and air lock keeps untouched. This is really stupid. I don't know is this AI bug or air lock can not be destroyed at all. I don't want abuse this because having such base will distract all alien attention to this "invincible" base. I think this is bug and should be fixed. If you want check yourself go ahead. Save file has attached. It's crappy beginner difficulty because I'm bad and just want win this game one time. But Ironman mode set to true, don't forget change to false it if you want experiment with RNG.