Chapter 242: Chapter 138: City in the Mountains

The electric car moved forward, and Yan Fei, who was on the car, observed the surroundings while using the Auxiliary Brain to build a model of the cave in the database. From the outside, the cave looked unimpressive, but who knew there would be such a vast and expansive world within. Originally, this interconnected cave system was formed naturally, but it was later artificially expanded and repaired to become the colossal scale it was now.

Yan Fei was constantly connected to his Drone Avatar, and by measuring the position and distance between his actual body and the Drone Avatar, he could determine his current location. Therefore, in the database of the Auxiliary Brain, any place Yan Fei passed would automatically appear in the cave model. The whole process was like the fog of war in a game map; as Yan Fei moved, the fog automatically dispersed, allowing him to see his position.