Open Water is a 2003 psychological horror film loosely based on the true story of an American couple, Tom and Eileen Lonergan, who, in 1998, went out with a scuba diving group, Outer Edge Dive Company, on the Great Barrier Reef, and were accidentally left behind as the crew failed to take an accurate headcount. Two in-name only sequels were made; the first In 2006, entitled Adrift; the second in 2017, entitled Cage Dive, which follows the first film's plot of being a survival shark film, again remains unrelated in continuity.