From AT&T whistleblower Mark Klein: "While on the January 2003 tour, I saw a new room being built....The new room was near completion. I saw a workman apparently working on the door lock for the room. I later learned that this new room being built was referred to in AT&T documents as the "SG3 Secure Room." The SG3 Secure Room was room number 641A, and measures approximately 24x48 feet."