People downvoting this because she had to defend herself against a violent dog and she couldn't get into the trunk because of the security system? All under an extremely stressful situation where she was suffering from decompression sickness, along with past trauma from her sister being in danger before and her mother placing all this constant pressure on her? Okay wow, if dead dogs and hasty decisions are what make a movie bad for you, maybe thrillers/horror movies aren't for you. Also people seem to be more concerned about the sister's dog than the sister stuck under a rock in freezing water so many feet down and running out of oxygen? Dog's fine guys haha it had a fire and can survive the cold much better than we can! Movie was beautifully shot and emotional. There was a LITTLE something lacking from it pacing wise maybe? (I'm not quite sure what it was), but overall it was a great movie.