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Thank you Don for your update! We all wish you the best with your future diving and especially with your health! Thanks again for sharing your story with us. It has lead to some lively debate, but I truly believe the community has gained further insight into the complicated topic of...

OK, so you have no data to back up this statement. That's fine. I just wanted to make sure that I understood what the statement was based on.

What data is this based on?

Ross, this statement doesn't ring true with me. Surely, exercise on any type of dive whether they be "everyday dives" (not sure what this means exactly) or big dives would create more gas uptake. When we exercise, the heart beats faster, creating greater circulation and greater gas intake...

Perhaps you missed the bits on pages 68-77 in the appendix. I suspect that much of what you are looking for, can be found there, but I get your point. Unfortunately, it is very rare that students come to our classes fully prepared to just be evaluated. Perhaps that is the fault of the manual...

Please see my response to Tbone above.

Good point! I don't disagree. At SubGravity our manuals are a work in progress and can certainly include more detail on skills. That said, we have included many of the most important ones, however, reading and doing are always two separate things! :) Otherwise, I could probably play...

Guys, believe me when I say that the crossover requirement is not about "benefiting the instructors". It's about keeping divers safe. I literally have never been involved with or overheard a discussion between instructors or manufacturers where there was ever any kind of discussion about...

Bob, although I understand your frustration at the thought of having to spend more money in an arena where you have already spent significant money, I feel strongly that your comment is a gross oversimplification of what is involved in crossing over from one unit to another. The "one day...

Agreed. It's a catch 22. However, as an industry, if we were to follow the same business model as the airline industry, we would make what is already an expensive hobby into a price prohibitive activity. I'm afraid that no one would be able to afford the significant cost increase this would...

This is a great question and really only one that can be answered specifically on a case by case basis after discussion between the manufacturer, student and the instructor (and in some cases the training agency). In the case you have referenced which is crossing over from a HH, Defender and...

Why do we see so many CCR instructors and divers use incorrect or inefficient protocols on the units they dive? Sometimes when I watch divers perform a specific skill, responses, or protocols, I have to stop, scratch my head and wonder “Why are they doing it that way?” Often, it may just be...

Ross, I don't claim to be a decompression theorist, but I am having a difficult time understanding your reasoning with this comment. Surely, supersaturation is an issue regardless of whether it is present during the dive or afterwards. Do you not feel that things such as altitude changes...

Hi Tony, I participated in the study along with both of my boys. The bubble scores were graded on a 1-5 scale, so for example after having completed a particular 100 meter Trimix dive, using a 15/18 GF with Pyle stops, I may have received a bubble score of 4+ or a 4 etc. After 2 or 3 such...

Joseph, thank you very much for posting your article. For those of us who don't have a serious background in statistical analysis, this is very useful in understanding the significance of the data! Thanks again!

My personal move away from deep stops was based upon several years of personal testing during Innerspace by the Dan Docs performing a multi year trans thoracic echo cardiogram bubble test on me. As I eventually moved from an 15/85 GF with Pyle Stops, to what eventually became 40/70 GF, my...

Adrian, I agree that much of Ross's statements tend to be filled with name calling and repetitious claims without content to back them up. That said, many people have indicated to me by private message that they have benefited from Simon's and UWSojourner's posts which have detailed, consistent...

Simon, this really made me laugh! Ross, It's time to actually start providing some useful data to back up your claims of "junk science". Otherwise, it is just junior high school name calling and whining. Simon has graciously taken the time to carefully answer and correct what he considers to...

Simon, it is this type of balanced response and in depth commentary which makes your posts of great value to this diving community. Thank you for spending the time to share this and other observations with us.

Great interview with Richie Kohler who continues to represent the technical diving community with a much wider audience on a worldwide basis! http://californiadiver.com/catching-up-with-deep-sea-detective-richie-kohler/