"47 Meters Down" is not based on a true story but is a fictional horror-thriller film. Released in 2017, it follows two sisters who become trapped in a shark cage at the bottom of the ocean. While the film incorporates realistic elements of shark behavior and diving dangers, the plot and characters are entirely fictional. The film aims to create suspense and fear through its underwater setting and the threat of sharks, rather than telling a true story.

In "47 Meters Down," the character Lisa, played by Claire Holt, ultimately survives after a harrowing experience trapped in a shark cage at the bottom of the ocean. After enduring numerous challenges, including running out of air and encountering sharks, she manages to escape and swim to the surface. However, the film leaves some ambiguity, as the final scene suggests she may not be safe, as she is seen swimming towards a boat but is surrounded by sharks. The ending is open to interpretation regarding her ultimate fate.

"47 Meters Down" was not filmed entirely underwater. While some scenes were shot in actual water tanks to create realistic underwater environments, the majority of the filming took place in a controlled setting above water. The filmmakers used practical effects and cinematography techniques to simulate the underwater experience. This approach helped to ensure the safety of the actors while still capturing the tension and atmosphere of being trapped underwater.

"47 Meters Down" is a survival thriller that follows two sisters trapped in a shark cage at the bottom of the ocean. It offers suspenseful moments and a tense atmosphere, especially for fans of underwater horror. While it received mixed reviews from critics, many viewers appreciate its effective use of tension and claustrophobia. If you enjoy shark movies or survival stories with a mix of thrills and drama, it might be worth watching. However, if you prefer more character development or complex plots, it may not meet your expectations.