This is one of the few movies that I can remember and maybe of all time where there is really only one character for the entire movie. There are some minor peripheral other actors in this film, but for the most part, this movie is about a Shark Attack and survival and the actor for the whole movie is Blake Lively. The last movie I remember that starred only one person was “All Is Lost” with Robert Redford which came out in 2013. That movie was extremely well done and I thought that Redford should have gotten an Oscar nomination for this role but he did not. As far as Shark movies, this film is one of the best I have seen in terms of the realism of a shark attack and the incredible damage they can cause to a human being. I think that this film must have been shot with a real shark and then superimposed with Blake Lively because the realism of the shark attacking and killing 3 other people was so believable.
If you are afraid of sharks then this is not the movie for you. For everyone else, I highly recommend this film.