searching for the movie title of a doomsday - ice age film?

I cannot remember it very well, but I do remember some excerpts.

-It's getting very cold and a man was swimming outside in a heated pool and came back in the house
- a shooting in a city where a group (the main actors) try to extract fuel from a rolled over bus or truck
- in the end, there is a meet up at a given checkpoint where a nuclear sub breaks through the ice and surfaces to pick the group up.

I don't remember a lot more. So if you can help, thanks!
 
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