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Mark The simple fact is that in order to do 70m + you need to have all your shit in one sock. That can be achieved by doing T2 first and then CCR or by doing an intro level CCR course and then a proper 70m+ CCR course. Just different ways to skin a cat. Graham

That (portillo) was hypoxia not hypercapnia.

flat the unit will rest on your back regardless of shoulder strap length, vertical (I have seen you dive lol) the unit will slip down you back and still be in contact with your ... wait for it ... back

Come on Nick - I could turn it back to you... Where do you think your back goes?

haha the 3mm of plate missing till you hit your back must make all the difference ;)

30million customers vs 1.4 Billion ... I know which Chinese I'd translate ;)

I have them with M25 - I am not sure about NPSM though - check with a BtS supplier in europe somewhere.

These two sentences are logically opposed to each other ... you're quite good at that :)

Why do a test that basically gives you no useful information. I don't care if cells can hold a spike for a short time at start of dive - I care whether they can make set point for the duration of the dive. Has anybody actually canned a dive because a cell couldn't make 1.6 at start of dive...

I am suggesting knowing your cells, watching during calibration, spiking above set point on dive occasionally and most importantly not cutting corners on replacing cells 12mo after manufacture but not luring myself into a false sense of security and wasting time checking at 6m at start of dive.

Not really - it doesn't provide any information other than at the start of the dive they read over 1.6 which has no impact later in the dive so it lures you into a false sense of security that the cells must be OK as I tested them at start of dive. All of these spikes and pots do nothing except...

Read what i said fellas - what Emmbee is saying goes against all nitrox / deco theory

You're in the wrong part of the country :D Look west!

If Tissue tension of Nitrogen was = to the sum of all the partial pressures found in the lungs (as you put pO2(lungs)+pN2(lungs)+pH2O) then tissue tensions of inerts would just be proportional to ambient pressure - thus there would be no point in nitrox or high PO2 deco gas.

If that were true high PO2 setpoints or deco gas would not work - as you might just be wrong you might wanna spare the condescending academic line too

Sounds like the oxygen window myth. Why would the partial pressure of O2 affect the Partial pressure of inert gas? Solubilities of one gas are not effected by solubilities of others. Either you are saturated at a particular partial pressure of inert gas (and hence tissue tension) or you are...

I wouldn't worry about it. Think about it - even you ascended outside the atmosphere its only like ascending another 10m. I don't have numbers but I would be surprised if the pressure drop at 2500' is equivalent to ascending even 3m and when you consider how long its gonna take you to drive...

In that case you need to clear your mask as its obviously full of water ;) Your mask should be full of air and anything pressed against the glass perfectly readable (assuming you can focus on something that close to your eyes)

There have been a bunch of calculations done on the forum and it comes out at negligible as to affect PO2 at 6m on deco so I would be surprised if it had any effect on buoyancy. Try this thread - I did some calcs as did some other folks on pages afterwards...

You need to man up Chris - heavy drysuits and cold water are easy especially in a quarry :D :D :D Graham