The dripping sound was heard about 20 steps after entering, and they walked clockwise, but before they finally entered another door, that is, Zhao Yan finally heard the dripping sound and walked no more than 10 steps forward.

in this way, after entering the cave gate, there is a small door about 30 steps away. The door should be a mechanism, but the sound is not loud. Zhao Yan vaguely hears a clang, and can't tell whether it's a door opening or a mechanism.

soon, Zhao Yan's veil was taken off. This is Tianchan's so-called factory. Looking at this huge project, Zhao Yan was stunned.

looking at Zhao Yan's surprised...