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Anyone who is old enough to remember Sea Hunt will know, Russian spies can show up at any time and will go straight for your reg hose. Be safe out there.

An article in the Orkadian confirmed the diver was considered deceased although they did not confirm the body had been recovered. I just left Stromness yesterday and I'm pretty sure of the accuracy of what I have posted. The victim was at a 3m safety stop and a boat that the victim was not...

I don't know all the details but apparently a diver was run over by a dive boat during a 3m safety stop in Scapa Flow Scotland a couple of days ago. Police are on scene at the dive boat and are treating it as a crime scene. I don't believe the body has been recovered. Locals are not saying much...

I think we are arguing a rather pedantic point. I prefer my dil to have a bottom PO2 of 1.0, and that is why I like a hotter bottom baailout. rjack321 claimed bailing to 1.6 PO2 was a bad idea. While your strategy is different than mine I am not convinced mine is a bad idea. Can anyone cite a...

So was your tox situation a result of exposure to 1.6 PO2 for a short durations, or something else?

Do you really think the value of the lower PO2 as emergency diluent offsets the benefit of the higher PO2 when bailing out from a deco situation? Firstly if you are in a situation where you are out of diluent you might consider ascending.

Please explain why you say that. I am not referring to the cave part because I get it but open water where direct ascent is feasible? Extraordinary claims require extraordinary evidence.

I usually schedule a bailout drill from 100ft with simulated deco on the first day of the class using air as bottom bailout. I suppose if I was concerned about stale gas in my bailouts I might re-think that plan ;)

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In another thread on another site there was a rather lengthy debate about this but the consensus was that at saturation the average human has about 1litre of absorbed inert gas.

Last year I retired my meg 2.0 (built 2001) it had never been upgraded or changed from original configuration. The reason I bought a tiburon was because my venerable old meg was mis-handled by an airline's baggage handler. It appears to have fallen off the cart and was dragged across the tarmac...

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thanks, I will dive into the reference list and that should lead me to my answers

Could you please cite your source? I have seen very little data quantifying the narcotic effect of gases. I have seen carparisons of solubilility of gases in lipid tissues and references to the Meyer-Overton theory but I have seen no scholarly articles defining oxygen impairment. This matter is...

Where did you get that statistic from?

I can't speak for others but for sub 300ft dives I carry a 32% bailout that I use to flush my loop during the ascent phase of the dive in order to reduce helium. Don't forget just because your lloop has been flushed with a non helium mix does not mean there is no helium in your loop. You are...

I don't know why we keep calling it a helium penalty. What it is, is that if we create a helium void by bumping up nitrogen and reducing helium, the greater portion of helium offgasses due to isobaric counterdiffusion. This works very well on paper. Try running a few scenarios on your favorite...

In spite of having over 1500 caves here on Vancouver Island, many of them underwater, there is little active cave diving going on here. The seasonal window is very narrow and most are quite remote.

I disagree that one tank needs to be revered. What emergency requires the shutdown of the valve. other than the dangerous situation caused by reversing the valve and leaving the 1st stage vulnerable? Why is it more dangerous to dive independent doubles, you said because more training is required...

Your plan would add way too much complexity for no return. Oxygen is a moving target because it is metabolized inert gases are in a fixed ratio and very predictable throughout the depth range