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One trick the diver can try in this situation is taking a bearing on the current direction before ascending and swimming against it on ascent/stops. If you can make headway or if the current is lower at shallower depths you can surface closer to the boat or even upstream of it. The biggest...

Me: has OMS slipstreams, size XL weighing in at ~2.4kg. They are neutrally buoyant excellent fins in good condition. I use them for travel and want to try something even lighter. I hear the eddy fins are actually positively buoyant. You: have Deep6 Eddy fins Size L which weigh ~1.04kg. You want...

This is an unusually excellent reference picture for understanding bottle trim. Good job @BlueTrin and @macado for the illustration

Sold. That was fast. Guess I should have priced them higher lol.

(SOLD) Up for sale are 1 Dive Surface Valve and 1 Bailout Valve priced to sell! Both came from the Hollis Prism 2 and match that unit nicely but will also work on most other units with 40mm hoses or coopers for those of you cobbling DIY monstrosities. Both are in excellent condition barely used...

I picked up a used set of the reef ID books on ebay - you could try that or other used book sources. Used books are generally in excellent condition.

I've found that field guides are one of the few remaining areas where the internet is seriously lacking and physical books still still rein supreme. There are some exceptions - there are some excellent birding and terrestrial plant apps, and some specific regional websites/apps (eg. njscuba...

Going back to OPs original question - another option would be taking some time to do lots of dives and build lots of experience with their new tech certification before jumping to the next level, whatever that may be.

What you should get the kids is... dive certifications to whatever level is age-appropriate. If not that, teach them to snorkel which is great prep for scuba later on. Its very easy for an untrained kid to over expand a lung and die messing around with even a tiny scuba tank, even in a pool. It...

There's a different feel to eyes closed vs. blindfolded/silted out.

I use electrical sync cables because triggering the strobes that way consumes FAR LESS camera battery than firing the camera's built-in flash to trigger strobes optically. Camera battery life is the limiting factor on the long coldwater dives (or snorkeling) I do so this is a really big deal...

If you're traveling and sidemounting rented Al80s for high-helium CCR bailout mix it makes sense to throw a small weight on the tank to help it trim out. But that's a specific scenario that not everyone is diving.

I would never store any long-term archival data that I care about on any cloud service, not even a reputable one, not even google. And especially not one that requires a constant subscription. Been burned before. All it takes is for someone to make the business decision that deleting your stuff...

That sounds promising - are the magnets rusted out or the lens scratched? How much do you want for it? (this is the first version not the later vaquita by the way)

Looking for this: Paralenz Maintenance Kit Paralenz service kit with replacement magents, front lens, plastic rings, orings, etc. Anyone have one lying around? Or know a source with some old stock? Out of stock everywhere / company is dead.

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...