Darnold9999:
A buddy is a backup plan and is not "responsible" for me - I (not my buddy) am responsible for keeping track of my air, my backup air supply(my buddy), and the plan for getting to the surface.
Hm. While I agree that I should be capable to take care of myself, this story is not really about what to do differently if you want to survive as a diver. This story is about responsibility towards your buddy. What would I as a buddy have done?
One take-home message here is the hazard of not making buddy relationships explicit. Another message is the importance of some reasonable leader/follower arrangement. (Probably, when there is a significant difference in experience, this would mean having the more inexperienced diver lead at his comfort level. Of course after having the most experienced diver make and communicate The Plan). There is more to be noted - all in hindsight.
But what really caught my attention was the following:
"[...] surveys of diving fatalities indicated that around 50% showed
no signs of behavioural change. In one third of the cases, the first
objective warning sign was a loss of consciousness. [...]"
Is that so? No signs? I'm not sure. I would guess (barring shallow water blackout) that there is almost always a stress situation preceding the accident: increased rate of breath, increased neglect of buoyancy compensation, increased, erratic waving of hands for postural control ... even if these are not "objective", they are noticeable nevertheless. And shouldn't we treat these as seriously as we treat an equipment malfunction? And teach to recognize them? And teach the social skills to deal with them?
Which leads to the really interesting part: at what point do you call the dive because you feel your buddy is not able to handle it? And this is not hypothetical: many, many of us have been in the water, paired up with someone they hardly know, who did not seem very competent. So at what point of observing this do you thumb it, and tell them "Dear friend, I can't dive with you. I can't, because I can't do it responsibly."
Because this is possibly what should have happened on December 13. 2004
And we've been there. And dove anyway.
With respects.