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I'm not sure exactly but I'll take an educated guess. While the water vapor pressure (WVP) is expressed in absolute pressure terms it becomes a constant that is added to the baseline of the inspired gas pressure adjusted by depth. Since the water vapor is not passed from the lungs into the blood...

The additional risk in some longer swim throughs may not be obvious to the average recreational diver. A few years ago I was diving in Cozumel with a group from the local dive shop. We did a swim through of Devil's throat (not sure if this is the right name) at about 100 ft of depth for about 20...

Not necessarily. If the definition of a tech dive is doing mandatory decompression then some tech dives can be planned casually in the water. Planning is not a requirement only for tech dives; plenty of rec dives are planned predive.

OK. So, what does the phrase mean to you?

I believe that bounce dives below 130 ft can be technical dives only if they result in mandatory deco. However, given the depth limits for recreational diving, some agencies may consider any dive below 130 ft to be a technical dive.

So, it appears that there are many definitions that can describe a technical dive including these: 1. Depth: <130 ft vs. > 130 ft. 2. Environment: open vs. overhead. 3. Gases: air or nitrox vs. trimix or heliox or hydrox. 4. Training: any but not vs. AN/DP, cave, deep wreck penetration, etc. 5...

If Guinness had gone out and told people/organizations to break records than I would agree with you but they're not. They post the records for general knowledge to the public. You are ignoring one other factor: that some of the people that are breaking records are doing so for their own personal...

The most up-to-date version of the spreadsheet is on the web site with all the corrections included above. Use the link above to get it.

Despite the fact that the article may have been written by someone not familiar with diving and its possible hazards, I didn't think he was guilty of neglect. What's puzzling to me is why did he have to make an emergency ascent, unless that meant skipping a safety or deco stop. Skipping a deco...

Electronics is the way to go until.......... Uh-Oh, my battery is dead There are special ToS for posting in this part of the forum Any political comments will be removed and if you wish to rant on political issues please use the "Pub"

What evidence? You cite the NEDU study which purportedly compared deeper stops to shallower stops but those deeper stops did not resemble any profiles divers use today or back when the study was done. Also, in the NEDU study there was no attempt to measure bubble size and their quantity and...

The central idea in bubble models that incorporate deep stops is to keep bubbles below a certain number for a critical bubble radius. The surface tension of bubbles acts to inhibit their growth. As bubbles expand this surface tension goes down and bubbles will tend to grow in size. As they grow...

First. I never said or implied I am avoiding ALL risk. I still solo dive. As to your comment to avoid all risk or seize the day, only a fool would make such a binary choice. Risk assessment and its subsequent mitigation is not an all or nothing affair. Risk assessment requires an honest and...

I don't have transmitters so after setting up my equipment I open the valve and leave it open.

I agree completely that nitrox should be a high priority. You can take a class without the need for dives which is great for divers in northern climes when it's too cold to dive. Also, if you have a chance to do multiple dives a day on consecutive days you'll appreciate the nitrox cert. Nitrox...

I would like to do more solo diving. I am certified and dive with an alternate gas supply. My wife hates the idea of it. I tell her I'm trained and have the right equipment for it explaining that I solo with a redundant gas supply and regs. She says "And do you also have a redundant heart and a...

Read up on ICD (Isobaric Counter Diffusion). That is your proof. My example above describes the situation that allows a possible DCS hit from ICD.

Inert gas will move from higher to lower pressure. Going from a deeper to a shallower depth means that our tissues being at a higher pressure than our lungs at a lower pressure will cause off gassing. That pressure difference is the partial pressure difference of each individual gas and not the...

Since the op mentioned men in her post I'll comment. The fact that women can last longer on a dive, all other things being equal, or surface with more gas is something that I've noticed. I don't think this is due to women having better lungs but smaller ones. Therefore, they have lower gas...