Hotshot Navy special ops guys get assigned to take a cruise to keep an eye on a VIP's daughter. Once the voyage is under way, somehow a nuke A) gets lost in the vicinity, and goes off. The resulting tidal wave capsizes the cruise ship, and its up to our heros to save the day
Practical Effects
Tilted hallway sets that wobble when actors touch walls
Acting
James Coburn's visible regret in every close-up

Director
John Putch
Trivia, insights & behind the scenes
Director John Putch is the son of Jean Stapleton (Edith Bunker from All in the Family), making this perhaps the most unexpected family legacy project in cinema history.
Released months after Deep Blue Sea and The Perfect Storm, this was part of a bizarre 1999-2000 wave of water-based disaster films that studios greenlit while apparently forgetting to check if anyone wanted them.