Post apocalyptic theory

I’ve always had interesting theories that are kind of backed by real world laws and physics and theoretically possible to survive in certain universes with strict regiments take the Snowpiercer universe for example the book and movie/tv series are different but theoretically if they could find some kind of shelter buried deep under the snow or something insulated as shit and create a fire or some kind of heating source their first real problem would be heat and energy hydration really wouldn’t be much of a problem since they could take snow melt it in a pot and boil it and for food I always thought since it’s so cold animals would be frozen towards the top of the frost and snow and theoretically safe to eat because bacteria can’t reproduce at -120 Celsius or -184f so if they could dig out an animal they could use that for food the main problem would be locating where they are and they couldn’t stay on the surface for too long even with the some of the best Antarctic winter equipment ever created I would definitely like to chat about this And I’ve got a few other universes too as well Are in theory technically possible That is backed up by certain laws and facts.