Piranha II: The Spawning

Piranha II The Spawning, also known as The Spawning and Piranha II Flying Killers, is a 1981 American horror film, the sequel to the 1978 lowbudget cult film Piranha, directed by James Cameron in his theatrical feature film directorial debut.

The next day, a group of tourists, including Tyler Sherman, are taking the diving courses provided by Anne Kimbrough, an employee of the Hotel Elysium. One of her divers swims into the wreck, which she has strictly forbidden to her divers. Leaving Tyler to take over and lead the others to the surface, she discovers almost immediately that her missing student has swum into the wreck and been killed there when his badly chewed up body is found.Annes estranged husband, Steve, a police officer, refuses to listen to Anne about her wanting to have a look at the body, because she needs to know what happened. The death does not seem to match the attack pattern by any of the marine life in this area, which she knows better than anyone. For her not to know what killed a diver is a dangerous sign. Steve intercepts Gabby, a dynamite fisherman, and his son, and threatens to confiscate their boat, but as Gabby explains, Steve, Anne, and he, are old friends. ........

Source: Wikipedia