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I've heard many a dive shop story of "and then my battery failed" or "I didn't have both deco gasses programmed" and lordy you'd think it was a total disaster. Vs knowing that a 190ft wreck dive has roughly 5 mins less deco time than a 200ft dive of the same BT, OMG the scuba police are coming...

Not exactly. TC doesn't have pluses in their stamped pressures nowadays. Dual rated DOT and TC tanks will have psi and a + as well as a metric service pressure with no plus. They are the same pressure though.

Transport Canada doesn't even have or use the plus whatsoever! That is the US DOT psi rating. The TC rating is in bar! And includes the plus level of pressure with a tiny amount of rounding. The only exception is very old US DOT tanks which predate TC approval and have some sort of reciprocal...

In Caverns Measureless to Man, they're diving 1/2s plus 200, so 1/3rds is actually an improvement over that :D

Not the first time old news has been repackaged with a flashy title :acclaim:

This was a downstream traverse, in a strong siphon, by intro divers, carrying a camera, who had never been in the system before. Being in sidemount certainly didn't help, but really was not directly related to this OOA accident. And *ehemmmm* as I previously pointed out, they all swam around...

Except if you look at the OOG fatalities that have happened in the last two+ decades one diver doesn't just spontaneously go OOA at max penetration with 2/3rds left for the buddy(ies). The whole group swims around lost until they are all low on gas and finally the first diver goes OOA and they...

In your FL centric universe sure... In MX there are next to no 104s at all and the "standard" cave doubles are al80s. A "standard" set of OC bottles in my neighborhood is a set of lp45s

I bring smaller bottles - but as a general rule I am not going any further distance than I would on OC. I am staying at that distance range longer (or it's taking me longer to find the way on in the cave at all).

They turn basically square as they get old. They are in compression but the force on them in the groove is actually lateral. So imagine the gas is trying to extrude them through the tiny slit between the valve and cylinder. The gas smashes them into the square groove so they never come out...

Nice work!

Negative. The water will (nearly) instantly wick/penetrate back through the cabling and flood your light head and battery canister. You can seal the cable ends with potting epoxy or potting silicon which *may* prevent the lighthead or battery canister from leaking in from the cable.

They were a response to the "best mix" nonsense of the 1990s and early 2000s. (which lingers today but most of us appreciate there's a better way)

Washington State itself is a cave desert. We have a tiny sliver of limestone at Snoqualmie Pass and another sliver outside the town of Concrete (the name is a hint lol). Otherwise it's 99% lava tubes in the Mount Saint Helens / Mount Adams area closer to Portland, OR. None of those are...

The times I used 25/25 in FL I started with a richer mix in deeper systems and then topped with 32 to water it down for Ginnie dives later in the week. Up here 25/25 knocks the edge off tiny, dark, 4C caves down to 110-120ft although only >90ft ish if its friendly (large ish, silt free) at...

The few 90m dives I have done I appreciated the lower O2 in 10/70 and shallower END too - with some decent dil flushing capability. But I don't do those enough to really have a standard.

AN/DP was a requirement for my MOD1 and I am appalled it's not universally required for CCR. You're using 100% and mixing on your back and its actually quite possible to dive a nitrogen generating machine (I don't know word for a worse than air EAD).

Yeah I can swim all the way to mainland and spend 2 hours back there and have basically 35mins of (50/70 GF) deco on 25/25 and Sp of 1.2. 90 minutes is crazy amounts of deco for anything exit side of the Hinkle

My only "yeah no thank you if I can avoid it" is 10/50. I've been on a charter that banked 10/50 though and in a when in Rome spirit I rolled with it. It's ok down to 200ft ish but really works the solenoid like crazy and its way too light on helium for anything deeper the 200ft for me.

32% down to 100ft 25/25 caves or down to 120-130 18/45 the universal dil down to 200 deeper than 180 is 15/55 down to around 250ft where the deco to value ratio ceases to be fun