Peter Attia

Let's go back to something you said at the outset, just because folks might not understand why the Navy would be interested in the effects of too much oxygen.

When you think of the Navy, you think of being underwater.

When you think of being underwater, you think of oxygen deprivation.

So what is it about certain types of diving that actually bring about the opposite problem?

Explain to folks exactly what that is.

How does a rebreather work?

What's the concentration of oxygen that they're breathing in?

And the reason that they can do that is because you're not wasting gas on the 80% nitrogen.

You basically store the CO2 that's coming out.

Once you've scrubbed it, you've got pure O2 coming in.

So your volume of air needed is much lower because you're just solving for the oxygen.

I do want to talk about that.

There's a lot I want to ask you about hyperbaric oxygen, but I want to finish the swing on this particular application.

When was it clear to the Navy the problem that you described, which is when we have closed circuit rebreathers with 100% oxygen, we're running into problems with our divers.

These problems are dramatic.

I mean, if you have a seizure at 100 feet, you're going to die pretty quickly.

So when did they come to realize this?

And was this a relatively recent discovery?

Was the Navy coming to you to say, look, we know this is happening.

Can you help us push the envelope?