Sounds familiar like the atomic bomb shelters in the 50’s everybody was building bomb shelters in there basements(even business had them for empolyees),FIRST of all the goverment isn’t going to tell you the truth,never believe them when they is a disaster (Look what happened in New Orleans)during cat. 5 hurricane,what would they do in a mega disaster. A major radiation attack would be devasting and even if one built the best shelter possible you cant stay in it forever and when one comes out everything would be radiated for months or years(no food,water,etc). My approach is everyones day is marked,could be days,months or years. So don’t hyper ventilate over it.