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I did not mean to imply that the cave comparison was a fair one, it is at an extreme, but that extreme blends into a continuum and, "where does it become a fair one?" in light of the training environment caution is a reasonable point for discussion.This is an interesting question, yes. To some extent, all training dives including open water dives are to some degree, "trust me" dives. So given that, how do you assess whether a breach of duty of care has occurred? I don't really know the answer except that perhaps one might judge the degree of risk involved in order to find a good delineator? But again, with something like risk we are talking about something qualitative that can be at times difficult to quantify.
As prudent instructors, we take measures to mitigate that risk. In open water courses, as you know, we run through skills training in the pool and do academic work to prepare the students for their open water experience, but no matter how much of this we do, it is still a trust me dive. A lot depends on what is judged as acceptable by us the instructors and the agencies. If you compare this scenario to that of taking a newly OW certified child into a cave on a trust me dive, I think there is no comparison as the latter I would consider to be poor judgement.
Your cave comparison is not exactly a fair one in the context of this accident. It is generally accepted that in order to cave dive one requires specific training by a recognized cave training agency by a qualified instructor. This is not the case for someone diving in the ocean for the first time, or should it be, according to your analogy?
There are elements that make diving Monterey different from Tahoe, waves, currents, kelp, sea life and apprehension come quickly to mind. I don't know if these were critical factors in this incident, I just ask the question in a more general sense. The agencies make great stock of the caveat but what are the nuts and bolts of heeding the warning?You know, the question of preparing someone to go from Lake Tahoe to Monterey is kind of an interesting one. Tahoe is colder than Monterey, especially in the winter and spring, so my guess is that the divers were well accustomed to the exposure protection they had to use for this dive. Tahoe has at least as much depth as you can reach in Monterey Bay, so having to watch depth and time shouldn't have been unfamiliar, either. My guess is that Tahoe doesn't have much current, but dives within Monterey Bay don't most of the time, either (at least to my knowledge). So the only major difference would be exposure to much reduced visibility, compared with Lake Tahoe.
Although reduced vis is something that can bewilder divers, remember that these two had already done two dives in those conditions, so it should not have come as a surprise. Nor does reduced visibility justify a failure to monitor gas supply.
Thinking about it, and again realizing it was NOT their first dive in the bay, I really don't see adaptation from Lake Tahoe as a big issue here. I'd be more suspicious that it was excitement at the amount of things there were to see that might have distracted them from good gas management.