Mike
Contributor
Very sad situation. One gripe I have about the dive industry is that they (IMO rightly) emphasize the buddy system but are, perhaps, somewhat casual in promoting training and systems that would make it more effective. In particular, widely used proximity sensors, I believe, are key to help reduce accidental deaths (when preventable). In water, and on the surface. Unless one dives with one's soul mate -- and both are super careful -- some separation during diving is common place. Add visibility issues, when something goes awry (e.g., out of air), the chance that a diver is left unto his own is significant. Yes, it's debatable whether a buddy would have been helpful in many situations (even with rescue diver training) -- and panic can put both divers at risk -- but if one is earnest about the import of the buddy system, just preaching to stay in contact/be vigilant is not enough. Technology-wise there are nontrivial challenges because surface communication techniques do not transfer under water readily. But it's probably not a deal breaker if there were a sense of urgency.
The only proximity sensors needed are your eyes. Stay next to your buddy and that's the end of the story. If you dive as buddies and break these basic rules, there will be a mystery instead of a simple rescue or at least an explanation to a death. This stuff happens over and over and over again and it's always the same question "where was the buddy?" there should never be a mystery to another divers disappearance or death. There is no technology solution to stupidity and lax techniques when the technique we are talking about is your eyes or if visibility is so low you can't see your buddy, then it becomes touch. Let's not make this more complicated than it is. If the surviving diver hadn't abandoned the other diver at the surface there would be no mystery to this story, and their might be 2 divers back on the boat. But if your buddy swims away from you on the surface like this one did, she basically left him to die alone.