The movie 'The Shallow' is a good one because of its true - story basis. It brings to life a scenario that could potentially happen to anyone. The director has managed to capture the essence of the real - life situation well. The isolation and the constant threat from the shark are effectively portrayed. It also has a strong lead performance that helps to sell the story. The movie makes you think about what you would do in such a situation, which is a sign of a great movie inspired by a true story.
One thing is the realism. Since it's based on a true story, it can feel more relatable. The fear and desperation the character experiences seem more genuine. For example, the way she has to deal with the shark in a limited space is intense. Another factor is the message of survival. It shows that even in the most dire situations, inspired by real - life stories of survival, one can persevere.