K City.
If most of the Subterraneans in Z City had survived thanks to Chinjao's arrival,
then the Subterraneans here had been brutally slaughtered, with only around a hundred captured alive by the Hero Association.
Madara Uchiha had never intended to show mercy.
The previous valley had also been sealed off and surrounded by military police to prevent any more Subterraneans from appearing.
Very soon,
as the major factions interrogated the Subterraneans, the situation in the Underworld gradually became clear.
At that moment, Morgan William was reviewing the compiled intelligence in his office.
They did not need interrogations at all. They only had to send Yamanaka Clan ninja to perform Memory Reading.
"The underground of this world is surprisingly lively."
The report stated that the Subterraneans had invaded the surface primarily because their population had recently surpassed ten million, and the underground spaces suitable for habitation could no longer accommodate more residents.
With no other choice, they had come up to compete with humans for the surface world.
It seemed somewhat strange.
After all, the underground was so vast and so deep. How could ten million people possibly lack space?
Naturally, it was because food in the Underworld was nowhere near as abundant as it was on the surface.
Moreover, stable and expansive natural underground spaces were few in number.
They could, of course, choose to create them artificially.
The problem was that the underground was home to many terrifying creatures, such as centipedes, spiders, cicada insects, ants, snakes, and rats.
They were both prey that could be hunted for food and natural enemies capable of hunting them.
After all, aside from a small number of mutated Subterraneans, most individuals were not particularly strong.
Thus, they did not dare expand recklessly through the Underworld, lest they provoke the anger and