Flutterby™! : Crack in the World

Back in 1964, when decent SF films were few and far between (just like now) I saw an exciting one on a Saturday afternoon at the old Milford theater, Crack in the World. Scientist Dana Andrews heads a UN project to drill through the Earth's crust in Tanganyika to release and then exploit the geothermal energy. To speed things up, Andrews borrows a 10 megaton h-bomb from the Americans and blasts through. Of course, it was too powerful and the apocalypse beckons. The heros use another h-bomb dropped into a volcano in the Indian ocean to stop the problem, which ends up involving blowing Tanganyika into orbit. Really.

Sounds like a good matinee? Maybe too good.