Yuan Ming carefully examined the stone wall in front of him, occasionally reaching out to touch and tap it.

After his investigation, he quickly discovered something unusual. When he tapped on a certain spot on the mountain wall, it produced a clear echo, indicating that there was something hollow inside.

"Could it be that someone has hidden some treasures here?" Yuan Ming's heart stirred, and he took out the Green Fish Sword from his hand and stabbed it in.

With a light sound, the Green Fish Sword easily pierced through, almost without any resistance. It was indeed hollow inside, with the stone wall only three inches thick.