He breathed like a fetus in amniotic fluid.
Fetal Breathing!
The signature ability of a Great Grandmaster; when one's cultivation reaches this point, even in outer space, a Great Grandmaster can roam about freely, with no risk of suffocation for a short time.
Because a Great Grandmaster's body can store a vast amount of oxygen and other gases, they can form an internal breathing cycle via the Dan Tian Qi Sea, breathing without relying on pores or mouth and nose.
In ancient times, Grandmasters were called "Land Immortals."
And Great Grandmasters had an even more widely spread title: "World-Dwelling Heavenly Immortals." This is because powerful Great Grandmasters, having mastered flight, once broke through a planet's atmosphere to roam through outer space, like satellites.
To ancient folk who didn't understand science—
A Great Grandmaster was a Heavenly Immortal walking the mortal world.
The ability of Fetal Breathing is thus crucial.
