Excellent discussion! Just a couple of weeks ago I reentered diving (after a hiatus of a number of years) on a fresh water diving trip with some friends from church. Among them is an instructor who also brought an oxygen kit from the dive shop that he teaches at. I was happy to see that my skills came back fairly quickly and I had in fact paired up with that dive instructor (through mutual agreement as we planned the trip) for the first two dives. The evening of that 2-dive first day, as we were sitting at camp reminiscing of the dives, I noticed that I was developing an ache in my upper shoulder muscles bilaterally symmetrical. I decided that I’m not going to “John Wayne it” and I pulled the instructor aside and described what I was experiencing. The first two dives were at depths of 30 feet or less, the majority being about the same depth as a safety stop. The majority of the time toward the end of both dives was spent in that shallow area. We had an interval of about 4 1/2 hours between the first and second dive. He correctly diagnosed it as simple muscle fatigue from not having had the weight of a BC, cylinder, and lead on my body for a long time and I wasn’t being careful about how I would need to tense my muscles when carrying that weight around. I’m over 60 years old. After some Tylenol, my issues resolved, but again I was not too proud to point out what I was experiencing. I guess age will give you a different perspective on the need to take care of yourself and that way. We had a ball for the rest of the week and the rest of my dives were very successful!!

Hello, I'm from Turkey and started diving a year and a half ago. I am now CMAS 2 star diver. I learned a lot of things from my club's instructors and get my own gear 2 months ago. Since then i'm watching lots of dive videos and yours are the best (my opininon of course). So i just wanted to say thanks for your effort and see you on the other videos. Have a pleasant day.

Great video Mark. I normally find something to disagree with you about in your videos, although I enjoy them all. But with this one, I think you covered all the bases.👏

👍🤿🇵🇭Thanks very good info!

Very informative thanks

I've had very mild tingling and numbness after a dive once after several hours and wasn't sure if it was o2 related or nitrogen. I think on successive days of diving hard i get cooler and maybe slows decompression the same way a hot shower speeds it up

Great video as always! Have one question for you... Is there any proven buffer to completely avoid DCI? Say, diving only 30, 50 or 70% of the time that dive tables suggest could reduce the risk (almost) completely of a undeserved DCI for a regular diver? Or as tables already have a buffer, the reduced risk from diving less time is not really noticeable? Thanks again!

First!!!

I Swim in a college pool. 13 1/2' deep. My Genesis Centauri flashed No Fly after swimming 4 miles. I do Lots of underwater swimming.

Would have been nice to know the age of the diver and the dive depths and times makes the rest of the info bit meaningless. Also, why no mention of tingling / pins and needles as symptoms, which are very common?