However, prior to Yan Fei's radar scans, no strange structures were discovered on the ground, nor was there any sign of life detected. But because the wind at altitude here was relatively mild, combined with moderate temperatures and frequent rainfall, the land was not desertified, but instead, looked very fertile, clearly conducive to plant growth.
Since something akin to the Control Boundary Stele wasn't found on the surface, it was also unlikely to be deep underground. Therefore, the most probable existence for the Control Boundary Stele was to be above the sky. However, Yan Fei had previously scanned the sky and found nothing but White Mist; hence, the Control Boundary Stele should not be in the sky either.
Nevertheless, by this time, Yan Fei had completed his examination of the surface and temporarily lacked the means to check underground, so he turned his attention to the sky. Only by ensuring this area was truly safe could he consider it as his development base.
