Chapter 497: Extraterrestrial Gold_3

The only reason was that the oil waterfall's downward flow was so substantial that the Drone's ascent was incredibly slow, and its suction cups also had to consume more Energy Points. However, Yan Fei had made a significant find in the Underground Space, and he was in such a good mood that he naturally didn't care about the expenditure of this bit of energy and time.

Yan Fei controlled the Drone to slowly crawl upwards, stopping every 10 meters to drill horizontally into the rock wall, creating a large hole. Then, Yan Fei began to install a type of high-powered Explosive that had just been produced by Dream Island.