C585 Sound of Water Flowing

At this moment, the strong man heard Professor Hu's words and frowned slightly. "The sound of flowing water? It can't be. Have we reached the level of underground rivers?" "How deep is this?" At this moment, Tang Ran only said, "That's not right, the flow of the underground river would not be so slow. Listening to this sound, it should only be a stream formed by a branch of a underground river