"Yes, since Dao Master Xia thinks so too, should we split open the mountain and excavate the stone until we reach the water pool inside the hollow mountain?" Fu Yu asked excitedly.
I thought it over and said, "There may indeed be a water pool, but Mount Luli is so enormous. If the pool is only the size of a house, we might not even find it after excavating the entire mountain."
"What should we do, then?" Fu Yu racked his brains. Before long, he came up with an idea and said, "We can use the echo method. At every place where a water source might seep in, we can use an echo treasure to detect how quickly the feedback returns. The sooner it returns, the more likely that place contains a hollow area, and the greater the possibility that it has a water source."
"If it's too far away, even an echo would be impossible. But you've overlooked one thing: if the area is too dense, it will produce a sound-absorbing effect. So this method can't be treated as the only option." I smiled.
"Could it be that Dao Master Xia has another method?" Fu Yu asked curiously.
I pondered for a moment, then nodded. "Perhaps I do, but I'll have to take a look first."
Fu Yu naturally didn't quite believe me, so he said, "How about this? I'll use the echo method to search for the water pool, while Dao Master Xia uses your own method. We'll see who can find it first. How does that sound?"
"Sure. What will the wager be?" I wasn't lacking for stakes, but pushing Fu Yu a little might help us find the water pool faster.
"The wager? What could I possibly give you if I lose?" Fu Yu looked embarrassed,