Daniel Kintner and Susan Watkins are frustrated that their hard-working lives do not allow them to spend much time together. They decide to go on a scuba-diving vacation to help improve their relationship. On their second day, they join a group scuba dive. A head count is taken and the passenger total is recorded as 20. Daniel and Susan decide to separate briefly from the group while underwater. Half an hour later, the group returns to the boat; two members of the group are inadvertently counted twice, so the dive master thinks that everyone is back on board and the boat leaves the site. However, Daniel and Susan are still underwater, unaware that the others have returned to shore. When they resurface, the boat has gone. They believe that the group will soon return to recover them.

Stranded at sea, it slowly dawns on Daniel and Susan that their boat is not coming back for them. They bicker, battle bouts of hunger and mental exhaustion and realize that they have probably drifted far from the dive site. They also realize that sharks have been circling them below the surface. Soon, jellyfish appear, stinging them both, while sharks come in close. Susan receives a small shark bite on the leg, but does not immediately realize it. Daniel goes under and discovers a small fish feeding on the exposed flesh of her bite wound. Later, a shark bites Daniel and the wound begins to bleed profusely. Susan removes her weight belt and uses it to apply pressure to Daniel's wound, but he appears to go into shock. After night falls, sharks return and attack Daniel during a storm, killing him. The next morning, Daniel and Susan's belongings are finally noticed on the boat by a crew member and he realizes that they must have been left at the dive site. A massive search for the couple begins immediately.

Susan realizes that Daniel is dead and releases him into the water, where sharks pull him down in a feeding frenzy. After putting on her mask, she looks beneath the surface and sees several large sharks now circling her. Susan looks around one last time for any sign of coming rescue. Seeing none, she removes her scuba gear and disappears below the water. Some time later, a fishing crew cuts open a newly caught shark's stomach, finding a diving camera (apparently that of Daniel and Susan). One of the fishermen asks offhandedly to another, "Wonder if it works?"

• Blanchard Ryan as Susan Watkins
• Daniel Travis as Daniel Kintner
• Saul Stein as Seth
• Michael E. Williamson as Davis
• Cristina Zenato as Linda
• John Charles as Junior
• Estelle Lau as Affected-Ear Diver

The filmmakers used live sharks, as opposed to the mechanical ones used in Jaws or the computer-generated fish in Deep Blue Sea. The film strives for authentic shark behavior, shunning the stereotypical exaggerated shark behavior typical of many films. The movie was shot on digital video. As noted above, the real-life events that inspired this story took place in the southern Pacific Ocean, and this film moves the location to the Atlantic Ocean, being filmed in The Bahamas, the United States Virgin Islands, the Grenadines, and Mexico.^[7][8]

During the audition, Chris Kentis and Laura Lau made it clear to Blanchard Ryan and Daniel Travis they would be working with real sharks in the film and that it was non-negotiable. "So I was like 'okay, that's fine' and I hadn't been offered the part or anything yet, and then when I was offered the part, that had already been negotiated," said Blanchard.^[9]

Open Water received mostly positive reviews. On Rotten Tomatoes the film has an approval rating of 71% based on 196 reviews with an average rating of 6.57/10. The consensus reads: "A low budget thriller with some intense moments."^[10] On Metacritic, the film holds a score of 63 out of 100, based on reviews from 38 critics' reviews, indicating "generally favorable reviews".^[11]

Most critics praised the film for its intensity and minimalist filmmaking, while it was not well received by the audience. Writing in the Chicago Sun-Times, Roger Ebert praised the film highly: "Rarely, but sometimes, a movie can have an actual physical effect on you. It gets under your defenses and sidesteps the 'it's only a movie' reflex and creates a visceral feeling that might as well be real".^[12] In a much less favorable review, A. O. Scott in The New York Times lamented that it "succeeds in mobilizing the audience's dread, but it fails to make us care as much as we should about the fate of its heroes".^[13]

Open Water was made for a budget recorded by Box Office Mojo as $120,000, grossed $1 million in 47 theaters on its opening weekend and made a lifetime gross of $55 million.^[14]

In 2006, a film marketed as a sequel titled Open Water 2: Adrift was released, although its plot is unrelated to Open Water.^{[citation needed]} A third film in the series titled, Open Water 3: Cage Dive was released in 2017, following the first film's plot of being a survival shark film, although unrelated in continuity.

• Survival film, about the film genre, with a list of related films
• Low budget film
• List of killer shark films

• Official website
• Open Water at AllMovie
• Open Water at Box Office Mojo
• Open Water at IMDb