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AI bots are going to be the death of forums. They are even starting off topic complaint threads now.

To be fair, the equations we use to model decompression correlate to reality a whole lot less well than the equations we use to model gravity and relativity. :) Although a black hole might beg to differ, I suppose.

Noting that you can't actually raise the pressure in the Atlantic by sticking a thin tube in it and filling it up with water because the water would just flow out of the bottom of the tube due to not being in hydrostatic equilibrium. :)

Well OK, so, under your hypothesis here, where and and at what rate exactly does this pressure drop happen? Instantaneously the moment the pressure gauge moves below the level of the roof? Or gradually - in which case how far do you have to move the gauge for the drop to occur? Would it start...

It bakes my noodle too, but your diagram convinced me that the pressure at X and Y will indeed be the same. A pressure gauge at the very bottom of the slender pipe just above where it opens up will read the same as a pressure gauge at the same depth in the wide pit. The diameter of the pipe...

Ah, the infamous Suunto 'adaptive' approach: "Hey there! You just violated one or more of the undocumented and unproven rules I have added to my code, so I'm going to go ahead and double your deco. You are fortunate I didn't decide to lock up completely and leave you on your own. Good luck!"

Just to add some real-world experience to all the theory, a number of years ago I experimented with swimming a twinset and wetsuit up from 30m while simulating complete catastrophic wing failure. Wetsuit was a 6.5mm semi dry, the twins Faber 12 litres. With an Ali backplate, I needed 1kg of...

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If it's a cheap knock-off, it may have been made by a source that has looked at pictures of backplates and has understood that they need slots and holes in them, but not understood the actual functionality and functional relationship of those slots and holes. It's hard to tell, but from the...

What make is the plate? And did you buy the plate and harness as a package (i.e. from the same manufacturer), or are they separate purchases?

Just about every T2 certified diver here has done longer than 90 minute run times in the ocean - BUT it's essential to be aware that conditions can change rapidly, to be knowledgeable about how your your local conditions work, to know the weather forecast, and understand that the longer dives...

All useful input, thanks all. Between me and my other half, we own 14 tanks already. (And under Aus standards, they all have to be tested annually.) I really don't want to acquire yet another two for the handful of occasions in a year when I want another twinset for boat diving - it just gets...

Helium mixes I can stick in my other two twinsets, this is going to be for nitrox use only. And I can get membrane nitrox so partial pressure filling not a problem. I'm prolly just going to get a regular manifold and put up with the assembly/disassembly but more wondering how much of an issue...

Alternative left field suggestion, just to spice the discussion up; Since I could be likely assembling and breaking down these twins on a regular basis when I want sidemount or single 12s; 300 BAR LOLA valves and flexible manifold. You know, like those rebreevery dudes use. Please explain to...

I'm in the market for an isolation manifold for Faber 12s; I have two Halcyon manifolds in use and I'd happily get another if they were still made. Regretting the two I sold. Must be: double barrel o-rings, 300 BAR DIN, rubber knobs. Ideally available off the shelf in Aus. Who is good...

A Luxfer 200/207 BAR tank is going to be negative when full. The tail will start to float up around 150BAR, and the whole tank will be positive (depending on reg) somewhere round 50BAR. Not sure if there was ever a 240BAR luxfer 7, but if so that would likely be negative even when empty.

Nothing droll about it, it's a serious question. You'd tell your other half to bring a personal divemaster because you aren't going to allow them to rely on you for any help? Of course you want to dive with competent people, and of course you can get yourself out of trouble if you need to...

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...