So maybe things that hint at this slow rad contamination; The water plant (sewage treatment) might have some glowing radroaches (I think they're in the geck as cut content, if not you could add the glowing ones actor effects to them). If there are any house plants they could show some unusual colors or blooms as minor mutations. Hydroponics may have some strangely colored vegatables, and have to constantly cull mutant seedlings that are cropping up (possibly some small mantisis that get into the air ducts from hydroponics). I have no idea how vault dwellers take care of their dead. Maybe they compost them through a chemical process, maybe they cremate them, etc. But if you do have a funeral/mausoleum type setup (and just about every culture has something to honor their dead). You could have a person or two over the decades that was pronounced dead and was in the midst of going through ghoulification. Then waking up in it's coffin/pod maybe gnaws on bones of the dead, but keeps to the shadows etc. Making for a more traditional view of the legandary ghouls of superstition. Make the doctors overburned by a steady stream of health complaints. Also I think heavily irradiated food tastes bad, so maybe some comments from older vault dwellers that the food has sure gone downhill. Maybe stuff like that? Does everyone know about the radiation leak, or just a select few researchers/doctors/leadership that keep it from the main populace to reduce panic? If that's the case uncovering/hacking secret terminal entries for evidence to overthrow the overseer might be a quest line. That's some good ideas there, I was thinking that the radiation would have leaked out into the went on the lab level. But small amounts could possibly travel further and get to the food storage making the food taste worst and also to the food production plant ( don't think I will actually make that room, but rather just have them mention it.) It would be cool to have a sort of cemetery for the vault dwellers, where people don't offend come to visit anymore because of rumors of a monster living there ( which would be a ghoul that woke up in his coffin after they taught he was dead.) Though I think that would be a tough cell to make, possibly modding existent parts and also placing them. Yes the doctors would be overwhelmed because of the radiation. I was thinking that no one would know about the radiation leak, but maybe have the player suspect that the overseers was the one responsible for the leak, as we have seen many other overseers that where the cause of the vaults problems. One way you could possibly find out that the radiation leek was planned by vault-tec is to hack the mainframe where the plan was stored. Or maybe the overseers was meant to know but some generations ago that information was forgotten/lost. The plan I got for the vault lab is that they have developed a more advanced of Rad-x which would protect you better but also have stronger side-effects, which would you say? They would also ( maybe ) have upgraded a advanced radiation suit to a highly advanced radiation suit, but that one also with possible side-effects?