Okay, I got to thinking about an older sci-fi movie I saw as a kid. It was around the mid 80's on HBO. It was about these 2 men and there 2 sons. They run in a bunker when WWIII breaks out. They are there for years while the kids grow up. Then the fathers leave the shelter to see the outside world. Eventually, the kids are adults and then leave them selves in the car that has been there. They dress like they are in the 40's and listen to swing music. I remeber the end when they see these two men in masks who turns out to be there fathers. It ends with them dancing with music playing. Not alot to go buy, but thats all I remember. I can't even recall the actors. Any help apreciated!