I love Blake Lively. Her acting and her looks. But this movie did not work for me. In my opinion, it was based on a faulty dramatic theory: that all you have to do is put the main character in danger, and more danger, and make the character's life hell, and then make it worse, and worse, and worse. And so on. And on. It got so ridiculous. It's like a character getting a broken leg, then a broken back, then a broken neck, then terminal cancer. Pretty soon, you're going, yeah right. It pushes suspending disbelief to its limits. And beyond. It strains credulity and your empathy. I was laughing toward the end. I only kept watching because of Blake Lively and her acting. "The Shallows" is in fact shallow, a lot like "The Revenant," which was really boring.