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About "vented earplugs," I would not recommend those for you. Ear plugs can cause a reverse ear squeeze. Check out everything else before ear plugs. SeaRat

Actually, the air situation was mostly guided by use of the J-valve. Most recreational divers could easily ascend by simply using the J-valve warning. There were other reserve mechanisms prior to the SPG, such as the automatic reserve, or the sonic reserve (Healthways). SeaRat

Just to be clear, the reason a dive watch’s bezel only turns counter-clockwise is because if it’s bumped, and the bezel moves, it will show more bottom time, not less. Bottom time is set from the time you leave the surface, until you leave the bottom to start your ascent. If I started...

Okay, now I'm going to ask a diving watch question; do you know why the bazel on a legit diving watch only turns counter-clockwise? SeaRat

You might contact these guys. https://www.vintagescubagear.com.au/2024/11/24/siebe-gorman-helmet-history/ I know nothing about hard hat diving and helmet ID, but looking at the photo, if it is real it may be Avery early helmet. Otherwise, some here have said it is a fake. I simply don’t...

Why the ear plugs? Do they even mention these ear plugs? SeaRat

This mask looks to be really nice for extreme cold water dining. But you’d have to get it under the neoprene for the wet suit hood’s facial opening, or it would leak badly. SeaRat

About diving without a mask, these things happen. While in the pool harassment segment toward the end of our training at the U.S. Naval School for Underwater Swimmers, Bob Means (my dive buddy) and i simply took off our masks and handed them to the instructors, who were about to harass us...

In the U.S. Naval School for Underwater Swimmers, Key West, Florida in 1967, if one of us was caught with a mask on our forehead, it would cost us at least 20 pushups, in full gear. “Who do you think you are, Mike Nelson? Drop!” The theory was that a mask on the forehead was easily displaced...

A kinda poor PLF during the POW/MIA Jumpfest, 1972. Closest I could come up with memory foam pillows… SeaRat

You mention that water in your wife’s nose is a big problem (or I read it in another post). May I suggest a fairly large volume mask with a good purge valve in front as a counter to that problem. Also, I think I related that I was diving for three years before ever receiving actual...

I thought I'd show you one of my dive debriefing sheets I filled out on August 11, 1977. I was testing my Nemrod Snark III regulator, that I had overpressure relief valve newly cleaned and repaired. I noted several small problems which did not affect the overall performance of the regulator...

There is one other aspect not shown here, and that is that the numbers included in their data are vastly different, and probably don't support normalizing to #/100,000. SeaRat

I have a place on my own version of a dive log for “Special Problems and Ideas,” which is a way of documenting what went wrong, or not quite right, in a dive, and/or any ideas I have for improvement. SeaRat

This is not a PADI class, but rather probably a U.S. Navy class of some sort. They are in fatigues and combat boots, which is not the PADI way of dress.

I agree, but mountain guides on snow and ice still will rope their people up, talk about how to walk on snow and ice, insist on crampons on the sole of their boots, etc. Now, for all you divers and dive instructors out there, I’ll say a few things about my insights. Realize that I’m also a...

Until something unexpected happens. If the DM has an emergency, and has to dive deeper to pull someone out of a bad situation, do they follow him/her? It sounds like a trusting situation where they are relying upon everything going as planned. SeaRat

Some of the finest diving conditions in the world! Simply enjoy, and don’t stress about your SACR. SeaRat PS, I have read some of the replies, and some are recommending what we used to call “skip breathing,” which is a hesitation between both the inhalation and exhalation cycles. I don’t...

Not, in my opinion, a competent person to be teaching anyone. This is not how someone learns. SeaRat

Yes, this was the dive that took Nemrod out of our “vintage diving community.” I don’t think he’s used a double hose regulator since. Nemrod, we miss you and won’t hold you to using a double hose regulator again, but there is a lot of single hose diving to be discussed too in the vintage...