https://pt.wikipedia.org/wiki/Abrigo_Nuclear
http://www.imdb.com/title/tt0194640/
Sinopsys: In the future, due to the radioactive polution of Earth's surface, it's population is forced to live underground, in nuclear shelters. These shelters are themselves powered by nuclear fission, which contributes even more to the radioactive polution of the surface.
A small resistance movement attempts a revolution to stop this practice, so that in the far future, their descendents could once again live on the Earth's surface.
Trailer created by me, using the original film's grim soundtrack:
The director's son created an Institute in memory of his late father, which hosts the complete restored film on it's You Tube channel, since 2015, but without any subtitles (the dialogues are spoken in brazilian portuguese):
I will hopefully write a review and commentary in a following post. However this film should only be regarded as a rare historical curiosity, not as a suggestion to watch (I will explain why on my review).