Trivia: No digital- or special effects were used in the film. The actors were in the water with real live sharks.
Suggested correction: You can see the edges of the pool the actors are in when there are "ships" on the horizon.
Not true. The film was shot on location, for three weeks, off the coast of The Bahamas. https://www.nationalgeographic.com/animals/2004/08/open-water-sharks-fear-real/#close.
Trivia: During filming the actors were not allowed to wear sunscreen because it was too shiny for the camera. They got terrible sunburns from the neck up.