Open Water

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. When they resurface, the boat has gone. They believe that the group will soon return to recover them.