Humanity's idea of an uninhabited region was generally restricted to extreme environments on land, such as deserts that were difficult to survive in, or tropical rainforests that were so dense they resembled an abyss.
However, a lot of people neglected the fact that a subterranean river basin under their feet was actually also part of that definition.
In fact, there were too many places in the world that humans had not explored yet, and sometimes, the unknown represented fear.
The dark river flowed around Zhou Qi. He looked at the sonar device and saw the red dot in front of him getting closer and closer. He could feel the ventricles in his heart rapidly expanding and contracting as his blood was pumped to every part of his body by this powerful muscle.
Then his adrenaline started pumping. Zhou Qi did not know what the moving red dot represented, but he knew danger was approaching.
