Nuclear war breaks out and the staff and patients of a mental hospital take refuge in an underground bunker and accidentally get locked in.
The film marked an attempt by Giorgia Mangiamele to make a more commercial feature than his first, being shot in colour, and using professional writers.
The budget was raised by private investors and Magiamele's camera and recording equipment were sold after shooting to help pay lab charges.
It was shot over three weeks in August 1968 mostly at a large underground room at the Royal Melbourne Institute of Technology.
[1][2][3] The director expressed dissatisfaction with the final product, saying that "I had no time to make the images look good.