Feng Jun's first practical exploration was the Spirit Stone mine in the Australian Sea Region.
Previously, he had never figured out how big or deep that deposit was. Now that the Stone Ring has been upgraded, it's a good chance to harvest a batch of spirit stones and test it out.
After reaching the Fourth Ring, Feng Jun's search for nearby objects was no longer a planar display but a three-dimensional one, as if he were standing in the void, sensing the presence of minerals in all directions.
The thickness of this Spirit Stone mine exceeded 3,500 meters, and the coverage exceeded his sensing capabilities. He conducted several comprehensive tests from different points and finally concluded: it was almost close to ten thousand square kilometers.
