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I have two books for you: The NOAA Diving and Safety Standards Manual: http://www.omao.noaa.gov/sites/default/files/documents/NDSSM%20Final_041217.pdf The Silent World, by Jacques Y. Cousteau. I read The Silent World three times when I was a kid, and got enough knowledge to safely scuba dive...

The amount of gas in the cylinder will not change because of depth. What changes is the density of the air that is breathed. At 33 feet, or 10 meters, the air density coming out of the regulator is twice that at the surface. At 99 feet, or 30 meters, the pressure is 4 times that of the...

The one thing I would look into a bit more is that it appears that the WK tanks are ungalvanized with a plastic coating over the tank. This is fine as long as it isn’t nicked down to metal, but once penetrated it is possible for more severe corrosion to happen in the area. Some people with...

'Sounds like you have some experience with chambers. I'd like to note that although "...60 fsw may be a procedure for treating type 1 bends simply on pure oxygen...", some people cannot handle pure oxygen at 60 fsw. The other caveot is that if the treatment is without anyone else in the...

The horns should not be used for leverage. Use, or build, a tool such as is shown in the March 1970 U.S. Navy Diving Manual for that purpose. It is not hard to make, and you can use the drawing below to do so. But I have to ask, why are your removing the "big nut"? It doesn't have to be...

This is between you, your doc (or other docs) and your family. Don't try to elicit opinions here, on ScubaBoard, as this is a very personal decision and none here know you or your medical history. Enjoy, John (SeaRat)

Anyone advocating for this “chamber” design should read over the Apollo 1 tragedy write-up. Apollo initially had a pure oxygen atmosphere, until a fire killed the astronauts, Gus Grissom, Ed White and Roger Chaffee...

One of my pet peeves is when people put together equations and don’t include the units. Without the units, it is difficult to say what he meant. The fact that it came out to 1.624 bar indicates that at least one unit was “bar” for barometric pressure, but what the others are is unknown from...

Well, let's go over some of the basics. --Mask clearing; before most masks had a purge valve, you needed to be in a head-up position to clear the mask (although some were able to clear the mask with a side-down position of the mask). That is mostly achieved in a kneeling position...

Note that when I started diving single hose regulators, there were no plastic second stages. Yes, on plastic second stages, use two wrenches so as to not tighten against the plastic body. ‘Haven’t actually ever seen a “heat exchanger O-ring” on my second stages. Is that specific to a brand...

I’ve heard of this happening to several divers here on ScubaBoard, but in over 60 years of diving, I’ve never experienced this. I do my own maintenance, and always tighten the LP hose to second stage down with a wrench. Is this not done now? SeaRat

Wallowa, We have a lot in common. I started diving in 1959, and am still diving. I wasn’t certified until 1963, when our high school dive club imported Roy France from LA County. I started diving on a used Healthways Scuba regulator, and then switched to a Healthways Scuba Star single hose...

Green Frog, I just turned 78, and am still diving, though not as often as I’d like. But the reason isn’t health or age, it’s that my wife has retired too, and we do other things together. By the way, I’m in Oregon, and so have yet to dive with this band of double hose brothers. SeaRat

You can also use the eraser end of a pencil, or a pencil that hasn’t been sharpened. But you press down with your hand, and the yoke screw is taken out. SeaRat PS—That was the work around I learned at the U.S. Naval School for Underwater Swimmers in 1967 for servicing the DA Aquamaster...

I guess I was asking about hose length, routing, etc. Are there any issues with the location of the valve being at your waist, to get the hose (usually about 32 inches long) to the BCD inflation hose? SeaRat

I’m curious, as a diver who’s never dived side-mount, how do you handle the power inflator for the BCD with this setup? I started diving before side-mount was even thought of. And I don’t contemplate starting it either. But it is a question on my mind. SeaRat

Tomorrow is Christmas Day, December 25th, and in 1968 we in Pararescue lost a great person, Charlie Douglas King. Here's a link that discusses briefly what happened...

AE, - If you are headed for PJ tryouts, be sure to get into shape. That includes both running and swimming, with an emphasis on swimming. The requirements, I think, are published, and you need to be sure to read them and to be able to accomplish them easily. The one thing I can say is that...

I have written about SWB and on several occasions discussed it here on ScubaBoard. Someone above asked how SWB can occur in a swimming pool. Here's what I wrote: I'm trying to attach the full discussion with the charts I developed here too. SeaRat

No, not necessarily. The reason is that the largest doubles we were using were twin steel 72s, with a normal pressure of 2250 psig (2475 psig if they still had the "+" rating). These tanks were not unreasonably heavy in the water. The photo below has two U.S. Air Force Pararescuemen diving...