Help me remember this crap late 80's early 90's post-apocalyptic sci-fi movie.?

I saw a movie when I was little. All I really remember about it is it starts with a group of people trying to evade acid rain. They find a scientific bunker with fresh water and one of the characters says something along the lines of "They were all cozy out here while the world was blowing itself to pieces of rabbit s*** outside." Then all hell broke loose. I think there were monsters or something, but I'm not really sure. Any Ideas?