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DRW, in your first entry here, there is this quote: This was actually experiments with the U.S. Air Force, not the Army. U.S.A.F. Pararescue had been established, and were making parascuba jumps into the ocean in support of both NASA, and the then secret satellite recovery programs. The...

This set looks like the Cressi Rondine. SeaRat

These look to be really nice, powerful and comfortable full foot fins. SeaRat

And, that’s the problem. You cannot “breath normally” in a full-face snorkel mask; you must breath deeply. You need to get outside air into the mask, and to “breath normally” simply won’t do that. SeaRat

Cousteau was a life-long smoker. He had lung problems toward the end, and needed positive pressure from the regulator. Hence, the chest mounted Mistral. In one of his last films, he said that the doctors had told him his diving days were over, and he was seen only on land talking about what...

So what looks like a cylinder inside the COPV is actually a bladder? Is the seawater that comes into the cylinder ever removed from the COPV? SeaRat

Now I’m really confused. So the inside cylinder is not the pressure cylinder, but a thin-walled aluminum vessel inside, which is not removed. But the valve appears from your diagrams to fill this thin-walled aluminum cylinder? How does the air get into the main cylinder when it is introduced...

Well, it’s taken me a few days to read through this whole thread, but I don’t have one answer that I really would like to have. That is how is the HP cylinder hydrostatically tested? How does it come out from the other cylinder? That question was asked early in this thread, but never...

Okay, I’m to page 4 of this thread, and I have a question. You say you “soak” your regulators in freshwater before heading out. Do you, when you soak the regulator, ensure that the yoke plug is fitted to the HP opening, and with an O-ring seal? Water, even freshwater, should never be allowed...

I have practiced an ascent without air from 80 feet. To do this, I started in a 16 foot deep diving pool (platform diving), and did a doff of all my scuba equipment. I then simulated an out-of-air situation by turning off the air, exhaling and trying to inhale without success. I then...

The interesting thing about some compasses on a counsel is that they are oriented differently, and some {like my Suunto compass) is offset so that you can look at it from behind. There is a viewing window in the side of my compass that allows it to be viewed from the eye level area. It's not...

In the U.S. Naval School for Underwater Swimmers, they had us start at 500 yards, and proceed to 1,500 yards. In the photo below, my buddy, Bob Means and I are on the 1,500 yard compass swim. You can see Bob has the compass on his left wrist, is holding that wrist onto his right hand, which we...

I’m not sure whether this will help or not for 3,000 meters. At any rate, your line should be marked off in the meters from the surface, as depth gauges at 3,000 meters (over 15,000 feet) won’t be accurate. (This chart, from a long-ago article by E.R. Cross, only goes to 10,000 feet for depth...

Actually, Sheck Exley died in a diving accident. He spoke mostly to cave divers, and had some good ideas. But he should have stuck to writing, instead of trying to set record depth dives. Frankly, I don’t follow what he wrote either; it doesn’t apply to my type of diving. Concerning the...

I stand corrected. Thank you. John (SeaRat)

If you want to be really safe, configure your dive computer to act like you are diving at an altitude of 4000 feet. Then dive the computer. I used to do that when I dove in Clear Lake, Oregon. I’d use the tables as if the dive were at 6000 feet, as after the dive we needed to drive back...

I was snorkeling at the Twin Bridges on the Siletz River with my then girl friend when she swam under the bridge, and began hooting and pointing. I swam over to her, and she said that there was a gun below the bridge. I did a surface dive, it was about 20 feet deep, and saw the rifle, picked...

Risk of Decompression Sickness (DCS) Johnny Conkin, PhD1, Jason R. Norcross, MS2, James H. Wessel III, MS2, Andrew F. J. Abercromby, PhD2, Jill S. Klein, MS2, Joseph P. Dervay, MD3 Michael L. Gernhardt, PhD3 1 Universities Space Research Association, Houston, TX 2 Wyle Science, Technology &...

DRW, I look at this entry a bit differently, as my training is in industrial hygiene. So I looked up in Google Scholar the topic "Rubber manufacturing and cancer," and got some very interesting results. From you photos, it does not appear that anyone was protecting themselves from exposures...

This one looks very much like the French La Spiro Champion Deluxe mask. SeaRat