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So if you were diving with your other half (...don't know your domestic situation, but take it as an example) and they had a problem, you'd ignore them because you were both diving solo?

All that may be true, but the discussion is (or at least was) about whether that MCCR is more dangerous when shallow than that same MCCR is when deep, not whether MCCR or ECCR is more dangerous overall.

Without getting in to a lesson about how SCRs work - the key differences are that 1. SCRs do NOT maintain a constant PO2 at any depth; PO2 varies with depth and will be lower for a given drive gas when shallow compared to deep; and 2. the PO2 in the loop is always lower than the PO2 you would...

One way of framing the discussion is to use moles instead of litres, since that is independent of pressure. one litre of gas at 1ATA (and normal temperatures) contains roughly 0.04 moles. (Molar Mass of Gas Calculator) Adults at rest at 1ATA metabolise roughly 0.01 moles of oxygen per minute...

??? No it doesn't - there is no difference between a failed solenoid (on CCR) and a failed/blocked orifice (on MCCR) in this scenario.

Yeah you will. If you start at a given PO2 and add no O2, the loop PO2 will drop at the same rate due to metabolism whatever depth you are at, assuming the same workrate etc etc. There is plenty of confusion about the difference between PO2 and PPO2/FO2 in this thread. Your (functioning!) CCR...

I do not condone the stealing of road signs to fabricate my designs from... :wink: Whereever did that story go? I bet there are many people these days who have never heard it. (Edit: found a copy of it: https://asiakas.kotisivukone.com/files/sammakkomies.kotisivukone.com/diverite_39.pdf - also...

Might help Dunsburough and Busselton

I'm relatively new in Western Australia myself so no expert, but: UWAUC are very active around Perth, would be usually a bit of a drive for you (assuming you are living in Busselton?) No solo diving from the club boat. Over time you do (partially) get over the price shock of the commercial...

The Katsuragisan is subject to strong currents, and I've personally experienced strong current on the Nippo as well. The Oite is far enough from any kind of land that even in the absence of current a PLB might be a smart, if imperfect, backup.

Hey mate, I'd personally say it would be better to have a PLB than to not have one. Mine is an ACR ResQLink plus that I keep in a custom divers housing, and I'd definitely take it to Truk and Bikini. IMO, the Nautilus/AIS messaging has limited utility outside situations where the boat is...

'Air' - the gas mix the atmosphere contains, containing approximately 20.9% oxygen, 78% nitrogen, 0.9% argon plus a few trace gasses. 'Nitrox' - any mix of oxygen and nitrogen. In diving, almost always refers to a mix with a higher percentage of oxygen than air ("hyperoxic"). 'Trimix' - any...

Nice work! Yeah, finishing all the edges is time consuming. It looks like it's come out a bit flatter than mine - how was the comfort?

We are basically in agreement, we are just talking about different things - which I covered in the comment "(But it's an altitude dive, so planning isn't the same as planning a sea level dive anyway.)" which was intended to indicate I was talking about physics, not dive planning. The actual...

Yeah that isn't true. There is a fourth scenario in addition to the three I listed above; where the entrance to the (water filled) cave is above sea level - many 'spring' type caves are like this. If the diver then goes to 20 feet depth of water in the cave then the nitrogen loading depth is...

What do you mean by "the cave is 100 feet below sea level"? If you mean the entrance to the cave is situated on land, in an area where the land is 100 feet below sea level - maybe somewhere around the shore of the Caspian Sea (List of places on land with elevations below sea level - Wikipedia)...

Answering, very specifically, ONLY the question about whether switching from a PO2 of 1.1 to 0.21 or vice versa would cause any issues - no, it would not. Technical divers routinely switch between mixes with greater differences of PO2 than this. The PO2 change you describe is roughly...

I'd consider two factors; A: Reducing work of breathing as much as possible is likely to help with clearing the hypercapnia - this would imply staying on your lowest density available gas for as long as reasonable B: In a hypercapnic situation, you probably want to reduce the level of PO2 you...

If this were true, you'd be better off still with a massive single tank with a Y-valve.

Yeah well maybe this is why Suuntos have a tendency to sometimes demand orders of magnitude more deco than other alternative computers... :wink: