Although he was certain there were Eternals on Earth, to be absolutely sure, Hao Shuai still needed to confirm whether a new Celestial named Tiamut was growing inside the planet.
After taking a deep breath, Hao Shuai focused his Divine Sense and carefully extended it into the Earth.
This was his first time sensing what lay inside the planet. After all, who went out of their way to sense underground?
His Divine Sense first pierced the outermost layer: the crust.
The crust was the outermost solid layer of the Earth. It averaged about 17 kilometers thick, with the continental crust being thicker, at an average of around 39–41 kilometers.
The crust was thicker beneath mountains and plateaus, reaching up to 70 kilometers, and relatively thin beneath plains and basins. The oceanic crust was far thinner than the continental crust, only a few kilometers thick.
The numbers made the crust seem not all that thick, but even that much was an insurmountable barrier to humanity's current technology.
After all, the deepest borehole humans had ever drilled was only a little over 12,000 meters deep—not even a tenth of the crust's average thickness.
After breaking through the crust, Hao Shuai's Divine Sense reached the mantle.
The mantle was the largest layer inside the Earth by both volume and mass, with an astonishing thickness of 2,800 kilometers.
After a little over three minutes, Hao Shuai's Divine Sense finally broke through the mantle and reached the Earth's outer core.
The Earth's outer core was made up of molten or nearly liquid iron, nickel, silicon, and other substances. Its temperature reached an astonishing five thousand degrees or more.
As for the pressure, it was a terrifying 3.5 million atmospheres.
Even Hao Shuai's current body would find it uncomfortable to enter under that kind of pressure.