In the crisscrossing mining tunnels, Chen Hai had been moving forward for nearly an hour.
At first, the sides of the tunnels bore marks from the extraction of minerals, looking extremely ancient, obviously having weathered the test of time.
However, as of now, when he looked towards the sides of the tunnel again, the holes on the tunnel walls, which could be seen sporadically, still looked fresh, as if they had not been dug out long ago.
"Is this not an abandoned tunnel? Was there mining activity here not long ago?"
Frowning, this thought spontaneously appeared in Chen Hai's mind.
Initially striding forward, he slowed his pace for caution, even applying the Concealing Breath Technique to himself.
After all, if the tunnel was still being mined, it was very likely that there would be miners around.
Using the Concealing Breath Technique to mask his presence, he did not want his tracks to be noticed by others.
