''Open Water'' is a 2003 indie drama/thriller hybrid written and directed by Chris Kentis, starring Daniel Travis and Blanchard Ryan as a thirtysomething couple who find themselves stranded at sea when coming back from a scuba dive and realizing their boat has left without them. Based on the true story of a married couple who were lost at sea under the same circumstances.

There is a sequel, made in 2005, called ''Film/{{Adrift}}''. [[DolledUpInstallment It was not initially intended to be a sequel]], but the similar premise gave them the idea that changing the title would be more marketable.

A second sequel, ''Open Water 3: Cage Dive'', came out in 2017.

!!This film provides examples of:

* AdultFear: Anyone with any involvement with scuba diving probably cringed throughout this whole film. It doesn't help that this has really happened.
* BetterToDieThanBeKilled: At the end of the film, [[spoiler: Susan, surrounded by sharks, calmly drowns herself rather than be eaten.]]
* DespairEventHorizon: [[spoiler: Susan, after her husband bleeds to death and she realizes she's not gonna last much longer]]. Also Daniel, earlier, when he screams "''We '''paid''' to do this.''"
* DevelopingDoomedCharacters: The first thirty minutes or so.
* DownerEnding: [[spoiler:Neither of them survive]].
* DrivenToSuicide: [[spoiler: Susan, by the circumstances]].
* HopeSpot: When the boat crew realizes someone's been left behind and launches a rescue attempt. It looks like they're going to get there in time [[spoiler:to save Susan. They don't]].
* ModestyBedsheet: Averted, probably because it's an indie film. Early on Susan and Daniel are shown in bed together, and they're as comfortably nude around each other as you'd expect a married couple to be.
* PersonalEffectsReveal: The final scene is a shark caught by a fishing boat having its stomach cut open, revealing Daniel's underwater camera. A fisherman wonders if it still works.
* PleaseDontLeaveMe: [[spoiler: Susan hysterically screams at Daniel not to "leave me out here all by myself"]].
* SayYourPrayers: [[spoiler: A dying Daniel babbles The Lord's Prayer as he succumbs to his injuries]].
* ShootTheShaggyDog: It is two hours of people stranded at sea waiting for a rescue [[spoiler:that will never come]].
* ShoutOut: The couple's surnames of Watkins and Kintner are those of the first and second, respectively, victims in ''Film/{{Jaws}}''.
* ThreateningShark: [[spoiler: The sharks eat one of them by the end, albeit not while they're still alive]].
* VeryLooselyBasedOnATrueStory: The movie is based on the story of [[https://en.wikipedia.org/wiki/Tom_and_Eileen_Lonergan Tom and Eileen Lonergan]], who were lost at sea after being left behind by their diving boat. As no one knows exactly what happened, the "at-sea" scenes (which comprise the majority of the movie) have been inferred.