Awhile back, HappyYellow and I had the bright idea of creating bomb shelter apartments. This way people could have their own space while confined underground.
HappyYellow mentioned last night using an RFID tag for her dog to let the dog in and out of a doggy door. This got me to thinking we could easily implement something similar in the bomb shelter apartments...this could help keep people out who are just following a crowd to shelter or who shouldn't be let in.
I know that sounds kind of mean, but we can't let everyone in or we won't have enough supplies. Kind of like Noah's Ark. Plan ahead people!