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in hindsight i should have skipped both OC and CCR, gone straight to submersibles

lol my mistake

Agree that the many contributing factors are well understood. But have we worked out the underlying biological mechanisms for why they affect narcosis intensity and onset? (And perhaps tangential, but more notable and strange, oxygen toxicity?) It would be interesting (or at least entertaining)...

The problem with doing these tests in a dry chamber is that, for reasons generally unknown, the human body seems to be SIGNIFICANTLY more resistant to narcosis and oxtox in dry chamber dives vs open water dives.

The (relatively poorly understood) mechanism of the two narcotics in question is thought to be similar. What kind of non-anecdotal evidence would you like to see for a subjective and highly variable experience other than personal accounts? FWIW there are a few anecdotes here, on this quirky...

I second that the few times I've been properly narc'd the feeling instantly reminded me of being a kid at the dentist. PERSONALLY I don't notice it until about 140ft, though I'm sure testing would show effects start much shallwer. Some days when I try to do math, write a legible page of notes...

I made this several years ago when I first bought my CCR but never posted it.

Tangential story time. One time I came up from a long shallow harbor dive (using a flag and a couple of lift bags) to find the harbormaster steaming mad, puttering around in his boat. He started yelling at me for blocking him out of his slip and said he had been waiting for me to surface. He was...

Wow haha didn't expect that strong a response but glad I asked. Now tell me about split fins and spare airs...

What do you all think of the system that uses a metal ring on the harness bungee and the upper boltsnap on the bottle sling cinched close to the tank neck? I haven't tried it but I'm curious after seeing a few very squared away divers using variations of this on their backmount CCR backplates...

Pictures would be great from anyone who is very happy with their setup and can post a few a clear images.

Will the kid be doing dives (or multiples) that even remotely approach any limits? He really doesn't need a computer if it's just shallow shore diving. But do carefully plan your dives and dive your plans. I did a lot of years of diving before I bought a computer. That said, shearwater is...

budget 200 meter mix

No we don't! No it isn't!

Wow that thing is awesome!

Here in the northeast US there are small skeleton shrimp that colonize shallow structures like docks and dirty boat hulls. They're fun to watch, even just lying on the dock peering into the water. But whenever I clean boat hulls hundreds of skeleton shrimp attach themselves to my suit and gear...

each cylinder contains a small save-a-dive toolkit

Neat. Is there science behind any of the shape? Even if not, looks like a sturdy simple paddle fin which is probably as good if not better than most fins.

No, but if a valve gets bumped on the boat or whatever and I forget to completely purge the reg then the pressure keeps the transmitter on and kills the battery.

Great video. I love those guys!