Bad movie.
Story was bad. It was not believable. The reason they suddenly got into the ocean was absurd. Poor writing. Poor special effects. Sometimes it's ocean, sometimes its swimming pool. The actress swim in the ocean, then the moment she got back up, she's instantly dry.
Someone wrote a long review giving it 4 stars because he's saying it was olivia's decent role in 20 years. I suggest you give her a review somewhere else. This movie is 1 star. And honestly, her acting was not decent. She was overacting. It was terrible.