Room 641A

A locked room in a San Francisco exchange where the internet forked into a splitter.

AT&T technician Mark Klein's 2006 declarations (Hepting v. AT&T) documented a locked room in the San Francisco Folsom Street exchange where a splitter duplicated fiber traffic to NSA equipment. The 2008 FISA Amendments Act granted the telecoms retroactive immunity, ending the suit. It is the surveillance file's physical exhibit: the internet fork you could stand next to.