what is the movie name?

what is the movie name?
this is classic Hollywood comedy movie where one day a plane crash happens on a house and the house owner couple think that it is atomic bomb so they already made a chamber in the ground and lived several year in that thinking that the outside world is radiated now so it is not safe and also raised their son in that chamber and after so many years when their son became adult then they sent their son outside to check if everything is normal or not