C316 I'm gonna pull you guys down with me

"There's water in front, it looks like an underground river, we can follow it." Once A Xiu finished, he sat on the ground beside him and said while looking at A Xiu: "Underground river? Just listen carefully, the moment you hear the underground river, you can tell that it is underground. How can it be possible for someone to pass through? Or are you thinking of someone digging a hole in our head