CptTightPants21
Contributor
Slightly out of context, but your insight is always beneficial. The cave deco thing is just one example.
Cave diving does have the potential for some unique deco situations that aren't covered in a normal AN/DP course. A diver wanting to go in that direction would be better served taking the course with an instructor that has experience with those unique situations who is able to impart their wisdom onto the subject. With a cave dictating your profile, there are some considerations that won't even be on the radar of an open water technical instructor, because by-and-large open water deco is always the same framework. The same can't always be said for a cave, hence courses like "Technical Cave Diver" dealing directly with cave deco.
Anyway, just one example where there's greater benefit going with an instructor who is more familiar with all aspects of the diving you want to do.
I'm going to have to agree with Ken. Deco in the open water is harder than in a cave. There are plenty of cave divers who have poor blue water skills because they spent so much of their time in the relatively easy deco confines of a cave. I think you are overstating the 'considerations'. Sure, if by magic you take a OW tech diver and put him back in the cave his deco/dive plan might be for **** because he can't ascend to his planned stops at the set time, but that is not how the real world works. No one is automatically doing deco cave dives. There is basic, intro, apprentice, full....by the time you get to doing deco in a cave you understand you need to look at the cave profile and develop dive plan that accommodates this. There was a question posted here a long time ago about how does a cave diver plan his deco if he can't ascend up, the general theme of the response was 'if you can't ascend up, then you are still on the bottom time portion of the dive'.
In a vaccum, if you were to ask me who would you rather take deco training from--a pure cave instructor or a pure OW tech instructor, I would go with the tech instructor. I think another good example of this is who would you rather teach you to run a reel? A cave instructor or a pure ow tech instructor---ans. the cave instructor. This is not to say that either instructor can't teach a certain topic, but they both have different strengths. For what it is worth, I have taken courses from about 12 different instructors and the best ones were those that had tons of ow and cave tech diving experience.