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Since the entire oxtox thing is about unnaturally elevated partial pressures it strikes me as completely plausible that there could be a sound reason that a half-life might apply at some particular point. Exposure to a ppO2 of roughly 0.21 won't kill for CNS related issues you even after dozens...

That would seem pretty obvious, but the same reasoning means that the original 1.6CF(?) spare air or even something substantially smaller is also better than nothing. At what point does that "better than nothing" become next to nothing? If that empty tank is an AL80 at 99' it's got 1.6CF of...

As I diver I'll state categorically that a dive vacation is warranted at any time for anybody who wants to dive. You might start by checking with the shop that certified you to see if they're running any trips. If they don't have anything that suits your needs you can start looking at other...

I don't know about you, but my body temperature is right around 98.6º. There's no way I'm going to get overheated in water that's in the mid 80's in anything that's not waterproof or fairly thick. The typical package at LCBR includes a 3rd dive after lunch, so you'll have even more time to lose...

I've got nothing for the snorkel, but here's something you can use: ...................................... ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ?????????????????? !!!!!!!!!!!!!! ;; Give me a shout when you run out and need more.

I've got a hypothesis. Maybe not hunting by divers, but we're not the only ones who hunt them. The big problem with any invasive species is that they usually have no natural predators when they first show up, and that usually allows them to multiply rapidly. Given enough time they become just...

As a fan of science fiction I've actually had thoughts along those lines occasionally. All (dive) vacations would have great weather. The only other divers would be the people I brought with me, and the reefs would still be pristine and undiminished by the activities of mankind. And if anybody...

I didn't want to thank or like that post, but I think it deserves some kind of award. I have no idea. Well, to be fair, I imagine there was a fair amount of pressure from people who thought they should be able to take their 12 year old kids diving with them.

Least favorite, no. I dislike them all equally. If it swims I've got no interest in eating it.

My first thought was that you should have noticed that during your OW class. Maybe it's a bit more excusable to not learn it now that most classes don't teach tables, but it strikes me as a very basic concept. I suppose that as long as you pay attention to your computer (and know how to use it)...

Average adult tidal volume is about 0.5 liters, and uninjured people in decent shape breathe about 12 times per minute. They may only use +/- 1 lpm of O2, but they're going to inhale and exhale about 6 lpm of gas, and for a diving injury that gas should be 100% O2. Injured people may breathe...

First, you mention "the last two weekends"; two of those 4 dives were either the previous day or even the previous weekend. Either way, they aren't relevant to the situation. Also, the way you tell the story is that you told the instructors you must have a cold some time before you had really...

That would be more accurate, but both the link you included and the original article in Alert Diver used that phrasing. Before posting I considered that I was nitpicking, but I figured that given the nature of the article (and of course I've got no issues with the underlying message) it's worth...

How did we get most of the way through page 6 before anybody brought that up? And how is it that nobody commented on this: "Very rare"? As in you're the only one it ever happened to on his watch, or it only happens to 1% or 0.1% of his students? I've got no quarrel with him saying he didn't...

I'm wondering if most people actually understand what instinct means. An instinct is an innate response that's more or less the mental equivalent of reflexively blinking your eyes if somebody pokes at them. It's not a learned behavior, and it's different than intuition or a gut feeling, which...

Interesting. You may have noticed that some LED lights look very blue compared to incandescent lighting, and that some LED lighting is available in cool white, natural white and warm white. I'll guess that the octopus perceived the light in that color and was trying to blend in. A bit of quick...

I haven't been everywhere, so I can't say that CocoView is the best, but it's definitely a great place. It's fairly easy to get to, though lately when I check the United website they want me to spend a night in Houston or pay through the nose to take an early flight out of EWR to make the...

My initial thought was to call BS on the idea because there's so little light when you get really deep that being blind can't be that big a problem. On further thought I'm figuring that a lot of the critters down there have really big eyes designed to gather as much light as possible. Big eyes...

You risk confusing people every time you open your mouth and say something, so if you're simply making a factual observation that's fine, though it strikes me as rather pointless without expanding on it. OTOH, if it's some kind of editorial opinion about what should or shouldn't be discussed I...

It hasn't been all that long since the apparent consensus of the dive industry was that 90' is deeper than any 14 year old should be diving. 90' deeper, to be exact. Well, the (second hand) report says he surfaced "screaming for help". If he'd just found his buddy unresponsive and wasn't able...