The Colony (2013)

IMDB Summary: Forced underground by the next ice age, a struggling outpost of survivors must fight to preserve humanity against a threat even more savage than nature.

The cinematic version of "Fallout".

Ok, not as clear as Fallout, but close enough: Instead of nuclear blast, the world is destroyed by some ice age due climate change and groups of people now live inside bunkers. Thing is, the bunkers can talk to each other, but they are running low on supplies -- meds and food -- so anyone sick is "removed".

Now, that the kind of scifi I do like, even with the low budget and just a few scenes from the big names (Lawrence Fishburne and Bill Paxton) and not-no-great acting from the new comers.

Sure, the "threat" is never truly explained -- or, even being in my ballpark, never caught my attention -- and never solved -- that part I'm sure -- but still, it is another movie exploring the way people act upon survival situations.