From reading other threads, I get the impression that these are regular building tiles. I have been told about them at the end of just about every turn by my survivor team. However, I can't seem to find them. My game has been ported all the way through beta, so maybe a trigger got broken/lost? Can someone point me in the right direction or let me know whether my world might be broken? My whole map is not explored yet, so it is possible they could be hiding in a corner... Thanks.