The 2019 thriller film 47 Meters Down: Uncaged may bring some ocean lovers' real fears about shark attacks to life on screen, but is the film as real as it feels? Johannes Roberts' film followed the success of his prequel 47 Meters Down, which starred Mandy Moore and Claire Holt as sisters who get trapped in a cage at the ocean's floor while deep sea diving. The second film follows an entirely different story with a very similar theme. However, as the title suggests, the characters in the second film swim with the sharks, uncaged in the ancient Mayan ruins.
https://screenrant.com/47-meters-down-uncaged-true-story-explained/