[You arrived in the Western District of the Underground Factory.] [Disguised as a Cleaning Robot, you passed through the vicinity, cleaning along the way.] [You saw that the entrance to the Western District ahead was covered with checkpoints and surveillance equipment. Yellow lines drawn on the ground indicated that this was a restricted area.] [Detecting your approach, the surveillance cameras above immediately turned toward you. In front of the entrance, an elderly administrator wearing reading glasses and reading a book in a recliner also looked up at you.] [You had no choice but to turn around before the restricted-area line and continue cleaning ahead...]
Mu You read the game text. Sure enough, even after arriving, getting inside was not so easy. An administrator had been specifically assigned to guard this entrance around the clock.
Next, he had his character circle the vicinity. Unfortunately, every place that looked like an entrance was tightly guarded, and even Cleaning Robots were forbidden from approaching.
Still, the same principle held: no matter how tight the defenses, they could never be completely airtight.
Since this Western District contained a Gu Pool with thousands upon thousands of Gu Insects, it had to produce enormous quantities of insect corpses every day. How was that waste removed?
Mu You continued patiently searching the vicinity.
About half an hour later, he did indeed find a place.
``` [You discovered more than a dozen Cleaning Robots gathered ahead, stationed beside a black river.]
[You approached and discovered large quantities of Gu Insect corpses floating in the river. These corpses were what had stained the water pitch-black.]
[These Cleaning Robots stood on both sides of the river like assembly-line workers, constantly fishing out insect corpses and tossing them into their built-in garbage bins. Once their bins were full, they