My husband has hinted at this, but I want to wade into it.
This class we just took was a class for RECREATIONAL divers. It was stressed again and again that the decision making algorithms we were being taught were to a fairly large extent dependent on the idea that we were RECREATIONAL divers -- meaning that our depth/time product was within certain limits, and the surface was almost always going to be a better option than remaining underwater in the face of major failures or problems.
Given this orientation, which was explicitly stated, we practiced toxing diver rescue, post failures, SMB deployment in midwater, and accurate ascents with stops from depth. We studied gas planning and gas management in exquisite detail, including how to assess the likelihood of getting two safe dives out of a set of doubles. We did air-sharing and mask off ascents. We were supposed to practice light failures and backup deployment (which I did when my light failed, although we didn't actually get to this in class). We did "simulator" dives where we were thrown failures, sometimes in multiples.
All of this is what I read about in technical diving classes.
But it "gave me furiously to think". When I took my original OW training, and the classes beyond that, it seemed that there was a clear and sharp distinction between recreational diving and technical diving. Even here on SB, you see that question posed, and it's almost always answered, "Technical diving begins where a direct ascent to the surface is no longer an option." But is there, in fact, a sharp dividing line (other than overhead)? If you are OOA at 20 fsw, go to the surface. It's easy and clear, and no major decision-making is required. If you are at 100 feet, in poor viz, diving off an anchored boat and needing to come up the anchor line if at all possible, and you go OOA, is a direct ascent really the best strategy? At some point, solving problems underwater becomes increasingly attractive or even necessary. If you are five minutes over the NDLs, but have a severe problem, is a direct ascent not an option? It's an option -- It has a downside, which is the risk of DCS, but an upside, which is the certainty of not drowning.
As I have learned more, it seems that there is no sharp dividing line between recreational and technical diving -- not in skills, not in knowledge, and not in concept. What there is is a gradation, where the surface (and DCS) becomes less and less attractive, and the risks and stresses of solving problems underwater become more and more desirable. And as that occurs, the need for the skills and the knowledge and the mindset of solving things underwater become more and more necessary.
And as I learn more, it seems to me that anybody who is expanding their limitations by diving deeper should be thinking about these issues -- the surface gets more and more distant, and the effort and risk required to get there increase; the issues that determine how long you can breathe (the critical factor) become more complicated, and the skills needed to solve problems underwater become more and more necessary. And how many of us get the training to be sure we have this all covered?
This class we just took was a class for RECREATIONAL divers. It was stressed again and again that the decision making algorithms we were being taught were to a fairly large extent dependent on the idea that we were RECREATIONAL divers -- meaning that our depth/time product was within certain limits, and the surface was almost always going to be a better option than remaining underwater in the face of major failures or problems.
Given this orientation, which was explicitly stated, we practiced toxing diver rescue, post failures, SMB deployment in midwater, and accurate ascents with stops from depth. We studied gas planning and gas management in exquisite detail, including how to assess the likelihood of getting two safe dives out of a set of doubles. We did air-sharing and mask off ascents. We were supposed to practice light failures and backup deployment (which I did when my light failed, although we didn't actually get to this in class). We did "simulator" dives where we were thrown failures, sometimes in multiples.
All of this is what I read about in technical diving classes.
But it "gave me furiously to think". When I took my original OW training, and the classes beyond that, it seemed that there was a clear and sharp distinction between recreational diving and technical diving. Even here on SB, you see that question posed, and it's almost always answered, "Technical diving begins where a direct ascent to the surface is no longer an option." But is there, in fact, a sharp dividing line (other than overhead)? If you are OOA at 20 fsw, go to the surface. It's easy and clear, and no major decision-making is required. If you are at 100 feet, in poor viz, diving off an anchored boat and needing to come up the anchor line if at all possible, and you go OOA, is a direct ascent really the best strategy? At some point, solving problems underwater becomes increasingly attractive or even necessary. If you are five minutes over the NDLs, but have a severe problem, is a direct ascent not an option? It's an option -- It has a downside, which is the risk of DCS, but an upside, which is the certainty of not drowning.
As I have learned more, it seems that there is no sharp dividing line between recreational and technical diving -- not in skills, not in knowledge, and not in concept. What there is is a gradation, where the surface (and DCS) becomes less and less attractive, and the risks and stresses of solving problems underwater become more and more desirable. And as that occurs, the need for the skills and the knowledge and the mindset of solving things underwater become more and more necessary.
And as I learn more, it seems to me that anybody who is expanding their limitations by diving deeper should be thinking about these issues -- the surface gets more and more distant, and the effort and risk required to get there increase; the issues that determine how long you can breathe (the critical factor) become more complicated, and the skills needed to solve problems underwater become more and more necessary. And how many of us get the training to be sure we have this all covered?