''Open Water'' is a 2003 indie drama/thriller hybrid about a twentysomething 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 ''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.
!! Both films have examples of:

* DevelopingDoomedCharacters: The first thirty minutes or so
* DownerEnding

!!''Open Water'' has examples of:

* 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.''.
* DrivenToSuicide: [[spoiler: Susan, by the circumstances]].
* FollowTheLeader: Without this movie, other movies like ''Film/{{Frozen}}'', ''The Canyon'' and ''OneHundredAndTwentySevenHours'' probably wouldn't have been made.
* 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.]]
* 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]]
* 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]].
* VeryLooselyBasedOnATrueStory: The movie is based on the story of 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.

!!''Adrift'' has examples of:

* CaliforniaDoubling: Although set off the coast of Mexico, it was filmed in Malta (in keeping with the movie being an InternationalCoProduction, German-produced but filmed in English with an almost completely American cast).
* DolledUpInstallment
* GainaxEnding
* KarmaHoudini: Dan is a [[JerkAss Jerk Ass]] who grabs aquaphobic Amy and jumps with her into the water (thus kicking off the ordeal), pops Michelle's dolphin floatie, botches the swimsuit-rope attempt and ends up mortally wounding Zach trying to protect a boat he lied about owning. [[spoiler: Naturally he survives, and only after an 11th hour [[InterruptedSuicide suicide attempt]] where Amy has to face her [[MyGreatestFailure worst fear]] just to rescue him.]]
* InNameOnly: ''Adrift'' was rebranded, post-production, as ''Open Water 2: Adrift'' to cash in on the original's popularity.
* MrFanservice: At one point the characters in ''Adrift'' remove their swimwear to fashion a crude rope. Lots of male nudity ensues.
* OnlySaneMan: James is the only one who doesn't act like a complete idiot at some point, having gone into the water after friends.[[spoiler: He later tries to break off a piece of the propeller to use that and the knife to get back up on the boat. He ends up fracturing his skull, which sadly brings him down to everyone else's intelligence level before ultimately killing him.]]
* TooDumbToLive: All the characters in ''Adrift'', especially the idiot who grabbed the woman who was afraid of water and jumped in ''without putting the ladder down first.'' Some of the others (James, Lauren) could be excused because there were other people on the boat when they went into the water.