If Feng Jun had been paying careful attention, he might have realized there was sonar detection, but it never crossed his mind.
This was in the vast Pacific Ocean, and he was working underwater. How could he have thought to guard against people?
After digging to seven thousand meters deep, the spiritual energy had become quite dense, but the temperature had also reached five to six hundred degrees. Even with the Spiritual Qi Shield, Feng Jun felt a bit hot.
He went to the mobile plane to catch his breath, then dived another three hundred meters. He took out his mobile phone—he really couldn't hold it anymore. Was the Spirit Stone Mine still far?
Not far, just over eight hundred meters below.
Feng Jun then moved laterally for nearly a day, roughly estimating the size of the Spirit Stone Mine.
The area was approximately ten or so square kilometers, with the thickness still uncertain. But with such an area, it would be considered a "scattered small mine" in the mobile plane.
