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The BCD looks complicated. Streamlined and trim. Two (somewhat) different things. For a good trim (i.e. being horizontal in the water column for less drag) requires some use of muscles. If you dangle from your BCD like a cooked spaghetti, there won't be any good trim. Legs will sink and act as...

I meant that while a lot of equipment may be worn/carried by divers, and a lot can be jettisoned too, two facts remain: 1. One will need a way to resurface (pick you favorite way, preferably two) 2. and before that, there must be a way to breathe underwater. To reach the shore was bad wording...

Well, it's nice to be able to reposition oneself. A helicopter turn, one frog kick, and one more helicopter turn to move three feet left is much more complicated than a few one-hand-one-leg swimming moves. Diving, after all, is the art of swimming (or walking, or working) underwater.

Well, 1) you will need to breathe 2) you will need to return to shore before you run out of breathing gas These things are quite important.

Plain steel can rust. Iron does rust a lot more. Do you paint your bottles? Paint does not rust. Never let water inside your bottles (this could happen if you run out of air). Now, if someone has actual experience, do trust them!

Steel

European sizes here, so you'll need to convert them. 7 litre 232 bar steels are great with a drysuit. 12 litre 232 bar steels are good with a drysuit. A bit big but with plenty of gas. As far as I understand, wetsuit divers use aluminum 80 cuft tanks.

Oh. You are correct, True that.

A clever choise. The all know that pure oxygen is just 1% argon.

The rear attachemnts (D-rings etc) of the cylinders should be moved forward. This would change the balance alleviating the weight in the front. Indeed. Move the cylinder D-rings (or clips) forward or get heavier fins. You might want to prefer the former. Yes. Those bottles need to be clipped...

I assume you can reverse with fin kicks or hands or both... but can you swim sideways? Sometimes you need to adjust you position three feet to the left, OK? Can you hover at the exact same depth for x minutes? Without excessive movement? Sometimes we forget that diving is the art of swimming...

Diving Nitrox 32 and then doing decompression stops on Nitrox 50 and later on Nitrox 80 (or pure oxygen) is a very valid gas plan especially for long duration dives to 100 feet. I have done dives like these.

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...