The film was thrilling and exciting, but I did find the running time a bit too long. The film became a bit of a dragged out rescue mission, although it is never boring. I did find the silly-ish humor inappropriate at times considering the nature of the film and sometimes the rescue workers seemed incompetent. Then again, maybe is was just to lighten the mood a bit. In general, though, this was a great production with some really tense scenes, and also very claustrophobic at times.