Search results

Hi, I would actually say the DM made a pretty reasonable suggestion. You will learn a lot about gas management and diving physics during the deep and nitrox courses. I would consider this combination a much deeper education than PADI AOWD. I also do not share the view that CMAS** would be...

It may of course be different for other people, but at least for me the concept of risk only becomes a useful quantity when I can compare it to other things in life.

Interesting. Myself, I often happen to think that driving my car is very unforgiving compared to diving, as in the former activity a split second of distraction can have irrecoverable consequences...

Yes of course, everyone has to make their own evaluation of what risk is acceptable for which subjective benefit. I am just saying that I very much like any educational statement to be phrased in the relevant context. I am against anyone saying that the risk in scuba diving was zero, as this is...

Kay Dee, the point is that mathematically nothing at all will ever be "safe". You see it in your posting: First you are saying that you think I am "dead wrong in implying it is a 'safe' activity.". Then, literally two sentences on, you are saying "That the dive industry implies it is 'safe' is...

I do not think a thread about one specific accident is an ideal place to discuss a very general risk level. This because when thinking of single events, one can sometimes (but less often than is claimed on such occasions) single out causes and mitigate future risks. But the general risk level...

There is an O-Ring on the first stage, on the front end of the thread, which provides the seal...

Indeed, and as I wrote already hours ago, the drag is the one thing that really may be different between total flooding and total implosion. But as a scooter would anyhow have to drag down a diver, the absolute difference would still be small...

Yes, it is trivial. But it really is the point of debate it seems ;)

Sigh. I left out "net", for simplicity. Yes, a lead brick will generate buoyancy, but this will be smaller than the antiparallel vector of gravity that inevitably results from the mutual attraction of the Earth and the lead brick. It will thus sink. A water brick will generate buoyancy in water...

boulderjohn, "zero buoyancy" means no force antiparallel to gravity because of displacement of surrounding medium. I do not take objection to your statements regarding an imploding or flooding scooter loosing buoyancy and thus becoming negative. That is completely correct! The only thing that...

Any volume only generates buoyancy when it is filled with something lighter than the surrounding medium that is displaced. When the cylinder is flooded, the light stuff (air) is lost and replaced by the same type of matter that is displaced (water). The buoyancy of the volume that is flooded...

boulderjohn, as I have written twice, something completely flooded can not implode, as it is for practical purposes incompressible. No disagreement there. The thing is that you arrive at the right conclusion (implosion leading to massive loss of buoyancy) via a misunderstanding. In terms of...

Under water the same as if completely flooded. We sorted this out already. Something that is already completely flooded can not implode at depths reachable to a human.

If a completely flooded scooter somehow managed to implode actually not. A water filled volume is neutral in water. The only thing that will in theory change is the drag when the scooter gets compressed. Probably not a huge factor. In reality incomplete flooding is however a necessary...

The problem here is that nothing is known about the accident. It is therefore not at all good reasoning to extend "most accidents could have been avoided by following basic safety procedures" to "this specific accident could have been avoided".

Well the "no different dimension" requirement probably rules out diphenhydramine then...

With relevance to arterialisation of bubbles, I would think various forms of shunts in the heart and the lung, yes. With regard to testing, all tests involve injecting bubbles, so there is a small risk. And a TCD will not show the exact location of the heart shunt, so if you want it closed you...

The first part is certainly true, a PFO can shunt bubbles. But it is far from the only shunt a human can have. The shunted fraction is very small, so anyhow the "target" tissues would still have to be prone to bubbling. And in the end, what matters is not appealing theories of how causal chains...

Michael, care to elaborate on scientific sources for this drastic view? If it is of help, there are I think some of the real experts in the medical diving community following this website. One can find their postings in the board. I understand the consensus view is to not advise testing for a...