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As another poster mentioned, for the most part it doesn't really matter because on rapid descents to significant depths I am adding diluent almost continuously. I routinely dive two different rebreathers: an O2ptima which does an instantaneous switch from surface to bottom setpoint and that I...

Quoting from Rebreather Training Historically, the rebreather training course was considered to be at the pinnacle of technical training with extensive prerequisites and contained an almost overwhelming amount of information; much of it being of questionable value and some information being of...

Mike, I believe you are thinking that as the diver descends on CCR, the loop PO2 will normally increase and can even spike high during a rapid descent typical of technical dives. However, my statement is not at all "problematic". I've investigated several accidents and personally observed one...

There is little justification for doubting the qualifications and experience of Mr Citelli, but humans do make mistakes and equipment does fail. If the earlier mention that he experienced an LOC during or shortly after descent is accurate then that is consistent with hypoxia due the loop PO2...

Quoting from ... Rebreather Training "At Rebreather Forum 3 held in 2012, statistics were presented which suggest closed circuit rebreather diving is five to ten times higher risk than open circuit scuba. Some of the statistical increase may be due to rebreathers enabling divers to attempt...

9 years is a long time relative to the speed of the internet, and the 2014 does not make a positive impression. Updating the Scubaboard Statistics section to recent data, or removing it entirely if updating the data presents a challenge, would be an improvement.

Sure it's made in the US... WR Grace Sodasorb... https://www.shearwater.com/wp-content/uploads/2012/08/Sodasorb_Manual.pdf Rebreather absorbent is mostly calcium hydroxide and it's primarily from the UK for the same reason steel mills used to be located near coal mines and aluminum smelters...

Not sure if you were generally expanding on my post or not. Partial Pressure of Oxygen (aka PPO2) is a more limited phrase that assumes diving a mixture of gases. A more encompassing term is "pressure of oxygen" which I chose specifically because it works even when the gas being breathed is...

Does not compute. :wink: %CNS calculations are based on exposure to a specific pressure of oxygen and time. Your question seems to imply there is a relationship between rate of respiration and a PO2. Just to be clear, there is no relationship between computation of %CNS and rate of...

Thats sorta like asking, who makes a specific model of car or a cellphone... Modern dive computers have gotten pretty sophisticated, it's not cost effective anymore for most major line dive equipment brands to make their own, the pretty much all sub at least some parts, so don't imagine the...

https://en.wikipedia.org/wiki/Dihydrogen_monoxide_parody

The generic label actually was tried in the form of previous 'safe harbor' amendments to P65.... as the law reads today, the generic label below is a sufficient warning... but as an unintended consequence they started appearing on anything and everywhere in order to protect not the public...

To be clear, P65 as originally envisioned in the 80's actually did have the beneficial effect of significantly reducing exposures to the initial list of less than 200 pretty nasty substances. However, it allowed ANY California resident to file a lawsuit alleging exposure and the burden of...

Certainly the firmware is stable and probably relatively easy to propagate to most of their other platforms, but the determining factor is what they have to do to the case and pressure sensor hardware to make it suitable for saltwater immersion to 100 meters - 330 feet. We are told that dealing...

Fill Express was one of the 'early adopters' in our area for refusing to fill the 6351's. At the time we were being told by industry experts and manufacturers they were perfectly safe to fill when 'properly inspected with an eddy current test' and based on the conventional wisdom that...

The 2640 psi LP cylinder true capacities have always been overstated. The source of the misrepresentation in Faber LP cylinders is their original importer for the US market. Many years ago the first US importer of Faber low pressure 2400+10% = 2640 psi steel cylinders did some extremely...

https://www.nolo.com/legal-encyclopedia/what-federal-supervised-release.html So from my Google reading, Federal time is very strict relative to states, parole is unlikely and only small credit for good behavior during incarceration - a maximum of 15%. Assuming good behavior then he is facing...

Well it turns out item #1 of Affidavit of Shawn Robotka answers the above question, the government was told by staff of Add Helium!!! Quoting "I directed Emilie Voissem to contact the Commerce Department regarding export..." And item #4 provides a possible insight as to why Sotis proceeded...

Apropos of nothing : Sotis currently seems to be defended by two Fort Lauderdale attorneys... Using the addresses in their most recent document filing... the lead council seems to be operating out of a coffee shop workspace with the co-council out of a strip mall. I suspect it is a tough time...

As much as it pains me to say it... I agree with you... looking back at what it took to accomplish this with so little benefit to public in general, I would have some serious second thoughts... but after a while we were "pot committed" and so pushed on. I can only say to myself that someone...