The impact was forceful, shaking the nearby walls. It was powerful, yet when it landed on the walls, the sound was very low-pitched. The prison walls must have been equipped with sound-absorbing or shock-proof devices.
Xia You could never have imagined that the source of the impact sound was a human head colliding. In cell number 3, a woman who could only be identified as female by her figure held her head and repeatedly slammed it against the door.
That "door" was different from the ones before it, made of tempered glass with double-sided paint. This glass is commonly found on the windows of cars belonging to national leaders and celebrities, and the interrogation rooms of the Rand Military District had also adopted this type of glass. The prisoner inside could not see the outside, but the interrogators on the outside could see every move of the prisoner crystal clear.
