On the Beach (1959) is probably the best and most moving film ever made about nuclear war. It’s understated, stoic, deals with the ordinary lives of ordinary people, and grants them dignity in the face of the death. The haunting theme of Waltzing Matilda threads through the film in various tones and modulations, emphasising the mood or providing a counterpoint to each scene. Quite brilliant – it never fails to make me cry.
There is a remake from 2000 to which I will not even grant a link. There should be a special circle of Hell reserved for directors who are so crass and untalented that all they can do is steal great original films and remake them as dross.