Perhaps, a useful piece of dive equipment would be a save-a-dive 'land bag', that would include a hammer to smash DVDs like Open Water, in the unlikely event that they are rented by a diver's family member. While the film was loosely based on the three actual events you mentioned - two divers apparently boarded a dive boat, were apparently left behind, and were never seen or heard from again - according to a number of comments in various places (including SB), any further relationship between reality and the film would best be characterized as accidental.This thread is inspired by the movie Open Water which my wife rented over the weekend. It is actually based on true events where a couple went on a dive boat, were left behind, and were never seen or heard from again. My wife was freaked out about the couple floating in the ocean waiting to be rescued with sharks all around them. She kept waiting for someone to realize they were missing and to start a search and rescue operation. No one notified the authorties the couple was missing and by then it was too late.
Summaries have been provided in other posts. And, just as a reminder, there have been several very good threads on SB about what gear is most useful for divers who may be the focus of a search at sea: http://www.scubaboard.com/forums/con...-point-of-viewWhat safety gear do you dive with and are you always good about taking it with you on a dive? Your SMB won't do you any good if it is in your dive bag when you are trying to signal the boat.