There are innumerable post-apocalyptic films. All but a few are nonsense. Probably the best, and most realistic, is a BBC production entitled The War Game, a television drama which depicted a nuclear conflict and its aftermath. The film was so appalling that the BBC lost its nerve and withdrew it, saying "…the effect of the film has been judged…to be too horrifying for the medium of broadcasting…" Despite this, it was shown, and went on to win an Academy Award for Best Documentary Feature in 1966. I saw it on PBS in that year and seem to recall that, at the end of the ghastly thing, there was a statement to the effect that in the opinion of experts who have seen the film, the real effects of a nuclear war will probably be much worse than are shown here.