Herag walked down the passage, noticing that the ground gradually turned into a normal earthy yellow.
In the areas near the surface, the soil layers were a dark black.
It seems the pollution didn't penetrate that deep—perhaps after seven or eight hundred meters underground, the soil is normal.
This depth should only be a reference, as the soil pollution levels can vary in different areas.
Herag examined the passage walls and the ground for signs, realizing no one had been here for a long time, nor were there traces of small animals.
"Why is this passage so long..."
Herag had been walking down the passage for a full eight hours, and it seemed he still hadn't reached the bottom.
He even wondered if the passage led directly to the center of the Earth.
Since the environment was similar everywhere, with no landmarks, he had no idea where he was located.
The passage twisted and turned with gentle slopes, not a straight line descending vertically.
