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"I am thinking 5mm full body but am not sure." I assume you're referring to a one-piece with full sleeves? I think a farmer john with a jacket is more versatile. I don't know if I get cold as easily as you, but I definitely prefer a bit more insulation than other people are generally using...

Not sure why, but I've long been under the impression that the long time before flying is significantly conservative, and partially related to the possibility of exposure to cabin pressures below the typical 8000'. The lower pressure could be be from flying in non-pressurized craft, as well as a...

Aside from the timeline, as Wookie mentions, I think there are two other issues. One is that, as near as I can tell, Willis hasn't said that 4:1 is indefensible; they've only said that as a matter of business policy they've decided that only 2:1 is an acceptable insurance risk. The other is that...

I'd say it's pretty simple, at least in terms of PADI's legal involvement. It's no longer a PADI DSP when you change at least one of two things: what you call it when you market it to people, or PADI's grant of authority to market and teach it. If PADI allows you to market and teach it and you...

If I was nearby I'd check it for you with some distilled water and my wife's food scale. The scale may not be 100% accurate but it's pretty consistent, so the vast majority of the difference in readings between a 2 liter bottle of distilled water and the same bottle filled from the lake should...

Not being able to find the specific gravity of the water doesn't mean there's not a lot of other information that may reconcile the claimed facts with the experience of others who are familiar with the lake. Using Google maps to measure a bunch of straight line segments along a meandering...

Does your buddy know how to calculate the volume of a sphere and how much gas is in an AL80?

Kind of like if your new car stops running and you're injured in an accident when the airbag doesn't deploy you'd be partially at fault because you didn't investigate the ignition switch to be sure the design was sound? Sure, you can make that argument. You're unlikely to be successful, but if...

Not exactly dive related, but check it out: https://www.youtube.com/watch?v=C_covjcIcZ4

Perhaps a few people think their standards are that bad, but that's not the discussion you and I have been having. Maybe you should reread the transcript to remind yourself where it started I only brought it up because of your straw man argument about "verdicts bankrupting the corporate...

I was simply making a point about the relevance of your statement about PADI's business success. There may be valid arguments that all PADI standards are as safe as they should be, but being "the most successful dive franchise in the world bar NONE. PERIOD." isn't one of them, just as...

Any chance you can tell us who the most successful seller of hamburgers is and the relevance of that success to the quality of the product?

Condensation. There's far less space between the molecules of liquids and solid than those of gases. The difference in density between water and water vapor is an example that everybody probably understands. One mole of water weighs a hair over 18 grams, and has a volume just over 18ml. The same...

Without a 3rd gas and the ability to vary the fraction of that gas it's an either/or choice. Do any rebreathers actually use 2 independent diluents? If not, then you can maintain a constant ppO2 by keeping fO2 inversely proportional to ambient pressure or you can maintain a constant ppN2 by...

I'm fairly sure you've convinced me that tissues that aren't well-oxygenated by breathing plain old sea level air might be subjected to higher levels of O2 while diving with nitrox, at least if done for the periods of time and O2 levels commonly used for hyperbaric oxygen therapies. Increasing...

My take on the OP is that the person isn't using both computers while diving as some seem to assume, but has simply compared the NDL's offered at specific depths in pre-dive planning mode. Doing simple calculations of NDL for a slightly reduced fN2 might easily get two computers to agree...

You must deal with an above average sampling of people. Or perhaps, despite being a US territory, most of the divers you encounter in Guam aren't American. My experience is that a significant portion of people couldn't even tell you what 10% of 100 is. The mere existence of little plastic...

Don't confuse your obligations, legal or moral, with those of the DM or the dive op. It's up to you to decide if you're willing to buddy with somebody when you think there's a deficiency in their gear (or knowledge, attitude, etc). It's not your decision if that person should be diving at all...

It depends on what you mean by "a little", and what tank you're using. The actual interior volume of a Luxfer AL80 is 10.7 liters. That means that at any given depth an "empty" tank will actually still have (10.7 * ATA) liters of gas. That means: 42.8 L @ 99 FSW 32.1 L @ 66 FSW 21.4 L @ 33 FSW...

Better still, put a piece of cardboard at one end of the battery compartment. That will eliminate problems from a switch that has been turned on by accident, as well as almost any damage that might somehow cause a short-circuit inside the light. I can only guess that they're worried about the...