There was a nuclear war you are one of the survivors,the only reasons you survived is because you retreated into the vaults like many other people,others survived without going into vaults,no vaults are in the part of the waste that anyone has found SO FAR.Some children haven't even seen the sky.I have not added vaults yet i might i may not.This is the sixth Wasteland Survival™.May keep the map may change it I don't know.