Dominic D'Agostino

Good question.

So hyperbaric oxygen, you experience that with hyperbaric oxygen therapy.

And there's 14 different FDA approved applications.

In that context, you only go to about a maximum of 2.5 to 3 atmospheres of pure oxygen.

In the context of military diving, like a Navy SEAL use a closed circuit rebreather because there's no bubbles.

So there's a stealth component to that.

You're breathing high concentrations of oxygen and at 50 feet of seawater, the potential for oxygen toxicity exists.

A closed circuit rebreather, for example, like a Draeger rebreather, like the original ones, those early rebreathers, and even now, it's high concentration.

It's essentially 100% oxygen.

You're breathing 100% oxygen.

So there's no nitrogen.

There's 80% nitrogen in the air we're breathing right now.

There's no nitrogen.

So you avert the potential for nitrogen narcosis.

So nitrogen's not narcotic at one atmosphere, but you get something called the Martini effect.

And as you go down lower, nitrogen becomes narcotic.

So that's something else that we study.

So you're breathing 100% oxygen, and then there's a CO2 scrubber.

So you're blowing out the exhaled carbon dioxide is scrubbed out from the breather, and it's a closed circuit.

So there is no off-gassing associated with scuba diving or even other types of