In this room, your heartbeat becomes an audible drum, your breathing is loud, and the silence is deafening. Welcome to the anechoic chamber ... of quiet with ingenious design.

Anechoic chambers are generally used for testing microphones and loudspeakers or other sound-producing devices when the absence of reflection is desirable.

But it presented a unique design challenge ... Building 87 holds what is literally the quietest room in the world. This anechoic chamber goes down to negative 20.3 decibels.

An anechoic chamber is essentially an experimental room lined with RF-absorbent material and contains an antenna positioner and controller that allows for a variety of empirical measurements of ...