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Lets clarify up a few things When you increase the O2 % in the breathing gas 1. you cannot go quite as deep 2. you can dve longer in the shallows

When I dive on nitrox 30,32,34 or even 40, and my dive buddy is on air we do this: 1. I declare the maximum depth (oxygen toxicity is the limiting factor over gas narcosis) 2. My dive buddy declares the dive time (his/her nitrogen load being the limiting factor) Which ever condition is met...

Now, while I belive this answer was not in the correct place, the message is an important one and worth bringing up.

I was talking about oxygen load. Oxygen toxicity and such. Not about the proper off-gassing of nitrogen. But yes, there are slower and faster tissues, and sometimes the slower tissues become a problem with nitrogen. The Subsurface dive log can show a tissue loading heatmap, which is very...

Nitrox, a blend of nitrogen and oxygen, contains air as a special case (Nitrox 21). The only differences that you need to be aware of are: 1. The maximum dive depth is no longer -56m (-184ft) but something much less. If you venture too deep and experience oxygen toxicity, it will most probably...

Dive knifes can be useful indeed. Some video from a fun little experiment:

Yes, it can, but twice the pressure is not twice the weight, hence not twice the amount, hence not twice the dive time To determine the volume of air at Normal Temperature and Pressure (NTP) from one litre of air at 300 bars, we need to account for the compressibility factor (Z) of air at high...

There are the rigid and heavy JetFins, decades old technology, still loved by many technical and cave divers or those who dive in high currents. Those fins demand at least a little bit of muscle power. There are the very flexible (and very very long) freediving fins so efficient in flutter kick...

Please remember the limited compressibility of gas. Past a certain point (like 240 bar) the actual amount of gas does not grow with the pressure. Hence, 400 bar is much less than twice the 200 bar. Go with the bigger bottles.

Allright, you have done quite a lot of diving. The reason why some people might recommend a SPG in addition to an air integrated computer I do not know. Maybe, if you do ice diving or cave diving you might find a reason for one or the other or both, but in shallow open water diving I guess it...

Yes, duty of care.

If your dives are shallow enough to allow for a direct ascent, then yes, you can even dive until you run out of air, and then resurface (please note that without air you cannot inflate a BCD so your buoyancy control needs to be perfect). There is a certain amount of risk involved though, and I...

Who would trust complicated devices and software made by engineers, if ones life would depend on it? A simple mechanical SPG is quite reliable. Not perfect, but very good. Consoles are big and awkward.

Drysuits can be more baggy and comfortable and can thus accommodate a diver that looses or gains weight. They are expensive though, and complicated to control, until you master the skill.

The water at Cancun might be 26.7°C / 80°F Do you need a wetsuit for that??? I am skinnier than you and I've been diving for 30 mins in 22C to 16C in swimming trunks. I am used to the cold, though. With your weight, you might have a good shape to conserve heat. Without a diving suit that loses...

Hi! Welcome to this international community. Tips for beginners: diving is a sport, it is a skill, and if you want to become proficient, you need to dive a lot there are many diving courses and certifications that are beneficial it's still underwater swimming, so you'd benefit from a skill to...

Three finger mittens instead of 5-finger gloves. Wear merino wool gloves underneath. Let them get wet. No problem. Make sure they are actually natural wool, and not 80% plastic (elastane, polyester, nylon, ...)

You will need a hood 7mm wetsuit, minimum Some people use more layers Eat well and rest. It sucks to be hungry, tired and cold.

Rubber, trilaminate or neoprene (crushed or not)? You can rinse it with a garden hose (or take a shower) as long as you do not spray water into the hood and thus into the suit. If water enters the suit, you will dry it for a week, untill the boots are dry ;) Sweat can accumulate, depending on...

Have you considered sidemount diving? With two small tanks? I've fallen on my back with such a rig and it wasn't all that terrible (because the tanks were to my sides and they were small). I can also carry them one by one to the water and don there. No heavy loads to carry. A flexible back. A...