Tommorow is the big day for the EFF's AT&T NSA spying case. There is a public hearing in the morning to determine whether or not the Federal Government will be able to assert the State Secret's Privilege to squash the case. Wired has tons of coverage, including information from the EFF's exhibits, which I'm linking here.

The normal work force of unionized technicians in the office are forbidden to enter the "secret room," which has a special combination lock on the main door. The telltale sign of an illicit government spy operation is the fact that only people with security clearance from the National Security Agency can enter this room.

The above-referenced document includes a diagram (PDF 3) showing the splitting of the light signal, a portion of which is diverted to "SG3 Secure Room," i.e., the so-called "Study Group" spy room.

Since the San Francisco "secret room" is numbered 3, the implication is that there are at least several more in other cities (Seattle, San Jose, Los Angeles and San Diego are some of the rumored locations), which likely are spread across the United States.

Now, the description offered here would be valid for a CALEA compliance room. The existance of these things doesn't demonstrate what is being surveilled or why or with what authority. But the technical information is likely of interest to the geeks on this site, including the tool used for collecting data (which is a common CALEA compliance tool). There is also a picture of the room.

The State Secrets Option, BTW, is the nuclear option in law. If this case proceeds it will be a watershed event, particularly given that this option was accepted in the rendition case of Maher Arar. Getting tortured by a foreign government is a bit more serious then getting your phone tapped.

Of course, consideration of this matter leads one rapidly to worry that that if the intelligence or security establishment commits a crime, and you are the victim of that crime, you have no recourse. This tends to incidate that the realm of intelligence and national security is an autonomous zone, where the only real law is "trust us."

Wired News: AT&T Whistle-Blower's Evidence