Heck...I thought this thread was dead a few days past.......... 
How do I do a 50m bounce?
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Would you not agree that if the OP has the experience that he claims to have that he wouldn't need to ask advice on how to go 10m deeper?
lamont
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No, Chad had about the same experience level.
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Oh ... come on. The OP had nothing to do with taking a bunch of same-ocean O/W buddies on a trip to 180 feet opr more. It was a question on how to conduct a controlled, no-D, next step after a series of 40m dives.
lamont
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Yeah, and the answer to that should be technical training. We don't live in an environment anywhere where there is support for experimenting with those kinds of dives, which means that he's probably going to be doing that outside of a support network of more experienced divers -- most experienced divers going to those depths will want nothing to do with those kinds of dive plans. That increases the risk of the OP finding a dive buddy who is inexperienced enough to say 'no' to him.
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what do you know about the support for diving of one sort or another in South Africa, especially for someone who is working at an aquarium? This is not a technical dive and does not need to be treated as such, nothing wrong with doing so but hardly a requirement.
We all waiting on the Gallop Pool of "experienced diver" attitudes. Until that comes out I suggest that we each speak for ourselves and stop trying to make an "appeal to authority" that does not exist. As to what increases and decreases the risk of finding a buddy of one sort or another ... that's a second or third order issue, that may or may not be relevant. It's a more reasonable assumption that he has a steady buddy with whom he made the previous dives, I'd find it a stretch to conclude that that he recruited a different inexperienced buddy each time he went out.
I'm just saying a lot of non-deco information generally stops at 130ft. For better or for worse, just because he may have done 130ft a number of times doesn't mean he should automatically know how to approach 164ft.
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130 feet is a stupid agency trick not a physiological boundary. It exists because that was where the U.S. Navy decided to make a normal operational shift from a scuba diver to a surface supplied air diver primarily because the no-D limits made scuba divers of the day rather useless in terms of work, nothing more, nothing less. In point of fact, the tables are all the same until you go off the standard air tables below 190 feet, just that the times get shorter. The additional big concern is narcosis, followed by CO2 retention and O2 issues (but those take longer dives).
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