t left, if…………"Before the driver could finish his sentence, Chen Ping jumped down. The driver was taken aback!And below, Bai Zhantang, hearing the sound of the helicopter, looked up and saw a black sh...d at the smooth surface, it was clearly man-made!"Could this be where the mechanism is located"Chen Ping stroked the groove. "But what's needed to open it""Mr. Chen, it looks like this smooth door sud...