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Don't you think the DataMask constitutes an example of prior art?

An ultra clear lens is not needed in such environments, where gauges need to be inside the mask. A typical situation mandating your mask would be zero viz. If visibility is good, you'll face fierce competition. I hope you succeed as the product sounds great! If your target audience is willing...

That's good for professional use, where the cost is acceptable. One problem though: public safety divers often use full face masks and commercial divers have their helmets. So... you need to sell this mask to hobbyists and volunteers I guess. And to people who can afford that luxury. You'll...

Indeed. I do a lot of zero visibility diving (search and recovery) and I would benefit hugely from depth, time, compass, air, ... but that thing was so expensive I had to choose older methods (such as: try to guess when a full circular search is done; guess depth based on ear equalizations...

We need depth, dive time, orientation (compass). Ascent rate warnings, air integration and average depth would be nice, too, but please make this somewhat affordable or you'll experience the Oceanic DataMask fate.

A local former sand quarry in South-Western Finland with tree stumps, lake mussels and other stuff. Details: Depth 9 to 15 feet. Temperature 25C/77F (surface) to 15C/59F (bottom). Visibility about 2m or 6 feet. Equipment: one 7 litre 200 bar steel cylinder hand held, one Apeks regulator, a dive...

Diving is the art of swimming (and doing stuff) underwater. Forward, backwards, sideways, reversing while turning and descending. There are so many ways to move in three dimensions! Many of us reverse with fins, others with hands, yet others with both. The number of different kicks is large...

You need to doff your double tanks. Nothing manadates taking of the mask before you sit on a sofa at home.

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.