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