what is this movie???? i seen it a few years ago?

commets hit the earth and everyone gets sick and dies but turn into zombies i think... and some how people are at a building they stay hidden in there and i remember at the end it shows the last of the people who live peeking out of the ground well not really the ground its the thing you hide in thats in the ground from tornadoes but im not sure lol please help its stuck in my head please help ive googled everywere

Update:

no it was before 2008 i think in 2006 or 2007

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