This movie is a surprisingly haunting tale of human survival, post apocolyptic events. It opens with the youngest member of a small group of mismatched survivors keeping a video diary of his life. The tale unweaves to show us how the tiny community are trapped in a world of corridors and bunkers, where finding food is becoming an increasing problem and with the continued threat of contamination from zombie like humans. If this wasn't enough to deal with there is also a strange almost supernatural threat from creatures who prowl the corridors bringing with them extreme cold, manifesting as mist and frost that rapidly creeps down the hallways. I don't want to give away the ending as it does complete the fable nicely.
The look of the movie really compliments the story, filmed in muted light and a dark almost colourless palette it has some very nice subtle effects that capture the claustrphobic world it is set in. The whole feel of the movie is one of a sense of doomed but persistant existance enclosed in a world that is slowly decaying.
On the whole I enjoyed the movie greatly and have watched it a few times. As a science fiction movie it does tread a path well worn, but manages to bring something of it's own. Definately worth watching if you like sci-fi centred on human relationships and a story rather than state of the art effects.