Really enjoyed the movie, right up until the end. A little over the top. Most of the movie you're sitting there trying to figure out what really happened outside, how can they escape, etc. Then it gets so far removed from the other 95% of the movie.
The only part I didn't understand is the part about the daughter and the "help" being scratched into the clear top of the air hatch door, plus the earring being found there. Was that supposed to be from the daughter, another girl? When was that supposed to have happened?