Speaking of Howard Keel, I remembered he starred as Hannibal in a musical comedy called Jupiter's Darling with the incomparable human-mermaid Esther Williams (I swear she reincarnated from the real thing). There's a scene where she escapes from some bad guys by jumping off a cliff into the sea below. She then performs one of her famous underwater ballet sequences, although from memory it was closer to an underwater swimming chase scene (the last time I saw the film was about twenty years ago). I couldn't find the appropriate footage on the Internet to show you, but thought that the uninitiated and younger ones amongst you might want to glimpse the wonderful MGM watery world of Esther through another appropriate substitute. Enjoy!