I have a memory from growing up watching 'The Wonderful World of Disney'....
I remember a scene from a movie, where there are 2-3 teens (?) in the backyard of a house in a sort of 'bomb shelter' type building... I think one of them may have been in a space suit ???...
I think I also remember them going into the basement of the house (entered via a trap door from the backyard)..
Any ideas anyone ?... I thought it might be from the Shaggy D.A., but I'm only guessing..