I've just been studying the colony schematics again. I think we talked about this before but I don't remember if it was resolved - the stairwell marked on the upper level obviously joins down to the lower level but I'm unclear in which room it comes out. From its location it seems to be off one corner of the dining area. Is that right? And no other stairwells? I'm sure a colony would have more than one if only in case of fire. :D