C344 Elementary Machinery Technique
After a few minutes of Zhang Hai's transfer, Ye Ziheng and the others finally heard a crisp sound.
"Kacha ~"
The sound was followed by a sudden vibration of the huge stone door. Smoke and dust fell from the door. In a short while, the stone door slowly rose up. In less than a minute, it had completely risen up.
The moment the stone door opened