It looked like a great plot and Sandra Bullock promised quality. But it turned out to be an average action movie consisting of a series of scences which are all about avoiding to look at mysteroius, insible creatures. So it got boring latest after the first half. All what would have been interesting, where these disastrous appearings came from, how they create those instant suicidal depressions and how to beat them was not shown. It was just danger 1 -> escape 1, danger 2 -> escape 2 ...... end. Feels like a cheap B-movie production