Is There Physiology That Allows a Creature to Use That Limited Oxygen for Two Hours?

Oin: I've been holding my breath for like two years, waiting for will to make something of himself. Why i was holding my breath, this show was actually scheduled. Sor we are running latethot, was those on me? There was. Oin says he'd like to know the answer, thath, how? What is the physiology that allows a creature to just use that limited amount of oxygen for two hours or yes. It's not just one thing. So if you combine all those three things, you have more oxygen, you use it really effective, and then you can tolerate a much lower level of oxygen than obviously, can dive for a much longer time....