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The amoeba enters the human body through the nose. It will have really hard time pushing through the glass first and then make an air jump to your nose...

The more I go up and down, especially near the surface = big changes in relative pressure, the more I get equalization problems (there could be other factors too, such as being nearly sick but not noticing it, etc). Is you diving stable or do go down and up a lot? Now, if this problem persists...

That's true. A short hose is never a requirement.

(technically longer than your buddy and his/her fins, but you get the idea; it might be better for the recipient to dive first)

You will want a long hose when you need to keep a distance. Examples: If you are a cave or wreck diver, then you might need to exit through a small hole while sharing gas. Unless the hose is longer than you and your fins, you're going to need to reverse through that hole. I can see how that...

Now, while I say that on the ground you lift the rig and stay stationary yourself, and in the water you move both the rig and yourself (in opposite directions), I remind you of the fact that this is a thought experiment only. You might actually want to validate things in a pool (replace the...

That's why most rigs have shoulder straps. Those can be undone. I can get out of a 50 pound back pack on dry land. Yours weigh less in water. You do not have firm ground to stand on, that's true, but you are basically pushing the shoulder straps, not planet earth, aren't you? Maybe this is...

Metal conveys heat better than plastic does. There is air inside the glove, though. Air is a pretty good insulator. In addition, you will wear some inner gloves keeping the outer glove away from skin and slowing convection. So, yeah, the replacement of a plastic ring with a metal one affects...

I guess we all agree on the importance of a rescue diver course (or stress & rescue or whatever it might be called by agency X) as soon as the diver is capable of doing one in a meaningful manner. How soon this course should be taken is a more difficult question as it depends on the individual...

You do not need weights or a BCD to dive in warm water. I do a lot of cold water diving in swim trunks carrying an AL80 cylinder (in my hands; your preferred attachment type may vary) and no BCD and no weights. Two pounds of freediving weights would be comfy, though. Hence, you could carry a...

Time and experience. And if you run out of gas you swim to the surface. 60 feet is doable, but it might require basic freediving experience to be safer.

The reason for this recommendation is that recovering an unconscious person from the bottom requires basic abilty to control oneself. Rescuing an unconscious diver was part of the PADI RD course I did a long time ago. Very basic dive skill is also required before anyone can perceive the...

You need to be able to keep a stable depth, stay somewhat stationary, turn efficiently and to be generally in good control of your position under water. Once you master that, and start to perceive what happens around you, only then can you start to rescue someone. It's not about the number of...

Well, I dive in 61F water in swim trunks. This is a bit extreme, though. Tolerance for cold will vary between individuals. The skinnier, the colder.

If you plan on undertaking more serious dives you will want two cylinders of gas. Cold water / drysuit might mean 12 litre 232 bar cylinders (Europe) or HP100 (USA) or something like that. Warm water and wetsuit might mean 2x AL80. Deep wreck dives at sea are typically done in backmount doubles...

Nice! Two suits. The black one is a diving drysuit for backmount divers specifically, while the green one is some sort of rescue suit for surface operations.

Decompression illness happens when the ambient pressure drops too fast and the nitrogen (etc) in your blood want to exit too fast. It can exit either to the exhaled air or, given some conditions (depth) are given, into the bubbles in your blood stream. Then latter, of course, is quite unhealthy...

This is a precious post. Thank you.

Well, I just assumed that salt water causes more corrosion than sweet water. Publishing an assumption is a way to ask for more detail. Hence, verification. No need to take that personally.

How do you attach the Xdeep wing? It has two holes, one in the top end and one on the bottom end. I have hard time understanding how these could be attached to 2 inch webbing. Or maybe publicly available sidemount plates (if I would use such) have appropriate holes? The whole problem here is to...