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I was looking at a local deal for a set of doubles regulators, G250v with ... something. I didn't recognise the first stages and it wasn't specified so I asked and got an answer and pictures: "Mk25s, best ever": That doesn't look like what I recognise as a Mk25 (I have a couple of those, of...

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During a working dive in the archipelago outside Gothenburg, a diver died the other day, Tuesday, the 2nd of January. There's an article, but it's vague and contains very little useful information (and in Swedish). Dykare död i Göteborgs skärgård – brott utreds What I can deduce is; It was a...

I was reading through Fundamentals of Better Diving in advance of Fundies, and came across an interesting and (to me) possibly dubious passage. This is the old first edition, not the more modern second edition -- I'm not sure why, but that's what we get sent in PDF form. I have the new edition...

Today I was the happy recipient of a pair of Xstream regulators from a decent eBay deal. Obviously, I knew going into it that the first stages don't have a bottom port (they have a "fifth port", it's just not in the place that implies on Apeks etc.) and that my hose routing would be ...

Noticed today that an upgrade to v93 is possible for Perdix AI. The only real new thing I noticed is that NDL can now be moved to the top right, with a new mini display taking the bottom right where NDL/TTS used to live. This might be nice for some high density info along the right side, but I'm...

So I was just down in Sharm and did some dives. After importing to Subsurface I notice that it has a somewhat different view of NDL times than the Perdix had at the time (and which the Shearwater app shows). For one dive, with both set to GF 45/85, the Perdix at one point says 8 minutes NDL...

I have a new-ish drysuit (Waterproof D7x), which is awesome except for the boots which are probably a size too large. When swimming I can feel them beginning to slip off my heel and need to pull them up sometimes. If and when things start leaking I can replace them with a size smaller...

I've started diving with an AL40 pony, added to my quite standard BP/W setup. It's stage rigged in the usual manner, and I clipped it off to my left chest and hip D-rings. I'm not a very tall person (172cm/~5ft7). The pony tends to point a lot downwards, at least 45 degrees or so, as the tank...

I made a thing during the holidays, mostly for myself but I hope it might be useful for others as well. It's an app to calculate rock bottom gas and gas time given SAC & depth for various cylinders, and also buoyancy and transfills between cylinders. It takes gas compressibility into account...

I'm a newish diver with 40 dives logged. So far in my diving I've been working with my breathing to slow it down and to control my buoyancy. To some extent that's successful -- I can follow a bottom contour adjusting for a few meters up and down with decent precision and hold a safety stop to...

I just acquired an old Poseidon branded allemano sub depth gauge. I would guess it's from the early eighties. It's in pristine condition, literally not a scratch on it so I expect it's seen very little use, if any. Question is though, is there a forty year old o-ring or two in there that will...

On my first dive after certification (boat dive in the tropics), at the end after the safety stop the DM signed something that was obviously a question but that I didn't understand. After some back and forth they grabbed my computer to take a look, and then we ascended. My conclusion was that...

So I did a couple of qualification dives today and I'm playing around with the data from on of them. I have a fairly simple situation where the second dive started with 168 bar in the tank and ended with 75 bars, on a 10 L (300 bar) tank. The average depth was about six meters. We were down for...