In just a moment, Little Hei had already dug to a depth of a hundred meters underground.
After reaching this depth, it turned towards Fort Deburg.
Ling Feng couldn't use Divine Sense, so he could only observe Fort Deburg with the naked eye, and hadn't noticed any movement yet.
If the other side were truly alerted, they would at least activate the alarm system and personnel would immediately mobilize, causing some commotion.
The result was that there was no movement from the other side; clearly, they were completely unaware of Little Hei's excavation underground.
"Now there's a way!"
Ling Feng chuckled, feeling that the opportunity had arrived.
But unexpectedly, soon after, Tian Lian said to him, "Master, Little Hei encountered an obstacle underground!"
"Hmm? What kind of obstacle?" Ling Feng asked.
"He was blocked by a layer of impenetrable concrete. He tried digging along the edge and found it was circular, possibly formed by the base filling it," Tian Lian replied.
