Open Water is a 2003 American survival horror thriller film. The story concerns an American couple who go scuba diving while on vacation, only to find themselves stranded miles from shore in shark-filled waters when the crew of their boat accidentally leaves them behind.

Plot

Daniel Kintner and Susan Watkins are frustrated that their hard-working lives do not allow them to spend much time together. They 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.