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R&D with actual T&E and certification requires the paperwork... There is no way to avoid it... DeepLife just opted to publish the background R&D done over the past 20+ years for the Open Safety units. There is a direct correlation with the amount of paperwork that can be published and the amount...

Some of the most cost effective R&D still hits $ millions pretty quick, but enables significant evolution from minor things like enabling the lowest Work of Breathing and comes from actually conducting Test & Evaluation of the assumed basics...

Refer highlighted Yellow sections https://www.opensafetyglobal.com/Safety_files/DV_O2_cell_study_E4_160415.pdf

If your gag strap is sitting behind your neck, you aren't getting the actual tested to the standard retention functionality required for the unit to pass EN14143 to prevent the diver drowning; when unconscious. Which is kinda the core reason for fitting it.... As mentioned above; it needs to...

Which is why Matan that it's crucial to test the performance of a BOV before relying on it for underwater life support. Caveat emptor. As to where you can get a good, well actually the lowest WOB in both OC and CC modes, BOV from see...

Based on the testing that Hollis published the WOB of the 2019 P2 is functionally the same with FMCL or BMCL at 1.56 J/L at 75lpm on Air at 40m when Horizontal on the set and increasing for both FMCL and BMCL to 1.67J/L at 75lpm on Air at 40m when Vertical; with Hollis DSV. With Hollis BOV it...

KISS Sport has a design WOB of ~5.3J/L at 40m, which is roughly twice the CE limit for safe breathing performance. See graph on page 64 https://www.opensafetyglobal.com/Safety_files/FMECA_OR_V4_180821.pdf Based on that and your workload at depth finning, you quite likely pre-planned to...

In a nutshell, unless you design and engineer it inhouse, 'patents'... and the sale/maintenance cost this adds combined with limited to no verification of their accuracy in use. Marten Silvanius http://bth.diva-portal.org/smash/get/diva2:1470427/FULLTEXT03.pdf sums it up nicely "Canisters are...

Out of curiosity I went and looked it up. Based on analysis of best available data, which itself is limited by lack of reporting, only about 9-12% or 60-75odd fatalities likely involved Hyperoxia..... so just a fraction of the 600+ that are known. Looks like about a 1 to 4 ratio compared with...

Which raises the question: what was the WOB as tested of the KISS Sidewinder rebreather in the configuration dived? How much higher was this than the optimum lowest WOB for a rebreather?

G’Day Simon, EN14143 has required a gag/crown strap/MRS/faceplate retainer to prevent the diver flooding when unconscious since 2003 on all rebreathers sold or manufactured in Europe. The Open Safety Apoc was simply the first CE certified rebreather to pass audit to the ratified standard and...

Thanks for that. But I note it differs from the AAUS interpretation of how OSHA applies to scientific diving irrelevant of the umbrella that the scientific diving is being conducted under.... Following AAUS standards doesn't seem mandatory, it just appears to be one accepted way for Cave CCR...

What gas was your BOV connected to?

How was the KISS Sidewinder modified so this couldn't happen again?

What was the documented and published OSHA compliant 'standard' KISS Rebreathers were using on this scientific diving to mark and differentiate their cylinders for depth? Anyone got a link to it? Based on this imagery In depth at 472 feet the only identifiable element appears to be white...

It should unusually for incidents of this type, be a pretty detailed accident investigation then, based on precedent set by previous scientific diving fatality in 2009, see Pg 139 https://archive.epa.gov/region10/diving/web/pdf/2013_aaus_esdp_diving_for_science-2.pdf Being scientific divers by...

Why? Logic and FMECA requirements indicates that the plumbing downstream of any OXYGEN 1st stage has been engineered to survive a HP seat failure and 300bar... This was a rebreather design lesson learnt back in the 70's by GE and Biomarine et al with the Mk15. FYSA the Apoc Type IV CMF...

Or if you want to retain the CMF function, upgrade to an Apollo A320 Oxy; factory set by Open Safety to 19bar IP

Mike, those headaches hurt don't they! You don't clarify if you're diving with a JJ-DSV, or BOV. If BOV whose? Why is this important... If you've substituted the JJ-DSV for a Shrimp BOV for example then you've probably increased your loop WOB and likely decreased the scrubber endurance from...

Note release written by Martin Parker Teledyne Discontinuing 02 Cells for Rebreathers Then: https://www.vandagraph.co.uk/?uid=&page=catagory&cat=295 and http://www.vandagraphst.com/about_us.htm