what is this film called?

Question

Set in the 70s. An experiment goes wrong and everyone on earth disappears. One guy is left who had something to do with the experiment and he goes mad and starts giving speaches from the roof of his house to cutouts of historical figures, then he meets a girl but she goes off with some other fella. Stricken with grief, the fella drives a petrol tanker into a nuclear power plant and ends up in another dimension and the film ends.

Answer 1

Can you email me when you find out the name of the film. It sounds really cool. [e-mail]

Answer 2

CHAMPA-70