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During no-deco diving, there's no reason for a diver not to go to the surface (I mean, all things being equal - no boat traffic, no heavy surf, no swim throughs, etc). If the rest of the team is on the bottom continuing the dive and the separated diver is safely on the surface... who cares...

Would I do it? Yeah. I also teach it as best practice no matter what's on your back (or sides). There's a value in presenting a giant surface area to the majority of upwards and downwards water resistance. It helps maintain a static depth and true neutral buoyancy, so your breathing cycle...

A few weeks ago I posted a whole blog thing about how to think about getting trim and buoyancy ultra dialed in so that one can hold perfectly still in the water. I posted this... you know... around. Every once in a while (read: when my wife reminds me to do so) I post something I've written to...

I'd like to revisit something I referenced in my original post in passing. I don't like to be touched. I have never suffered any sort of trauma or abuse (as far as I can remember, anyway); I just don't like being touched. It freaks me out and makes me extremely uncomfortable. And yet people...

There is touch contact in a cave course. Yes. It is required. Can we allow students a feeling of a controlled, safe environment where their personal boundaries are not strained or broken? Yes. It should be common sense. Lots of folks chiming in here are adding quite a lot to that side of...

I just happen to teach mostly cave and technical diving; but these issues aren't restricted to the cave/technical world. If anything, I think that my colleagues among the cave/technical instructorship (certainly the ones I see around me working each day) think much more carefully about these...

I'm gonna guess that was a "why?" and not a Mike Myers gag? For OW DPV there's probably no real reason to do such a thing; in case of a failed DPV you'd surface and flag down the boat. The boat is faster than a DPV anyway. The majority of the classes I run are some level of cave diving. If...

These are some excellent ideas! I admit that I go with the - relatively low-tech - quiet word as a private aside to avoid any perception of peer-pressure. But I also have the luxury of the fact that I don't even remember the last time I had to work with more than three people at a time. Just...

*** FOR THE RECORD *** The language of this post is not my own. It has been edited (probably for the better) from the original. My thanks to whichever moderator took the time to parse this all out and make it presentable on Scubaboard. And my thanks to all who have thoughts to, hopefully...

One in four women have experienced sexual assault to some degree in their lives. This is not to suggest that every fourth woman that you meet has been violently raped at knifepoint - but, statistically, you probably do know someone who has. Just because someone hasn't had a knife to their...

From the "it hurts when I do this" school of diagnostics.

You know that moment when you're trying to hold absolutely still, but you wind up swimming around in circles? Or when you get to a safety stop and you know that you've been absolutely neutrally buoyant for the whole dive, but for some reason 15 feet seems especially tricky today? Yeah. You're...

Did I? Which of us is having tacos in Playa for lunch in a few minutes?

Who wants simple, conservative-minded squide-factors during an actual dive? It's much more fun to geek out about pointless, theoretical, mathematical pressure differences that are far too tiny to be measured accurately with the instrumentation produced for divers, especially given minuscule...

Not precisely an answer to the original posting question. Not precisely. But this is a table (a triplicate copy of the same table) I laminate and give to my students which fits in a wetnotes. I made it because I suck at math - and don't trust my ability to, say, divide or multiply by 7 in my...

There's a dive site here, Nohoch. The average depth is 12 feeth. You can be there for hours, but it's only 12 feet. Breathing 32%. Apply Dalton's triangle and you wind up with a PN2 of 1. Only a shade above normal atmosphere. So, in theory, you couldn't possibly ongas a ton. And could, in...

To be fair, if the plane were to lose cabin pressure at altitude, there is the potential to smash into the Earth at 500mph, too.

Simple question with a complex answer. For background, I am asking as an instructor. I am not trying to take a class, not from this or that instructor or agency. I don't need to learn how to use this rebreather or that piece of awesome equipment you bought. What I'm asking is how instructors...

People frequently want to bring their rebreather to dive with us down here and I always ask for a CCR Cave card. When I get the common enough, "I dive my rebreather in the cave all the time, I've never needed a card before," I simply ask "What is your bailout radius at an average depth of 30...

There were a handful of things that have been long in the making which are on their final prep to launch as of the last CREER meeting. CREER is the Comité Regional de Espeleobuceo, Ecología y Regulación. Figure out the translation on your own. It's a new-ish organization moderated by a board...