Open Water is a 2003 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 because the dive-boat crew failed to take an accurate headcount. None of the 26 other divers or five crew members noticed that the couple was missing. Source: Wikipedia
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