Strange Russian "numbers station"

In the new issue of Wired, Peter Savodnik wrote a great story about the very strange Russian shortwave station UVB-76. Known as the Buzzer because of the buzz patterns it transmits, UVB-76 is most likely a "numbers station" that governments use to transmit secret info to operatives around the world. The article reminded me of the piece I wrote about Numbers Stations for the old bOING bOING Digital webzine back in 1999. Fascinating stuff and I love that the mystery continues! From Wired:
 Magazine Wp-Content Images 19-10 Ff Uvb76 F The amplitude and pitch of the buzzing sometimes shifted, and the intervals between tones would fluctuate. Every hour, on the hour, the station would buzz twice, quickly. None of the upheavals that had enveloped Russia in the last decade of the cold war and the first two decades of the post-cold-war era—Mikhail Gorbachev, perestroika, the end of the Afghan war, the Soviet implosion, the end of price controls, Boris Yeltsin, the bombing of parliament, the first Chechen war, the oligarchs, the financial crisis, the second Chechen war, the rise of Putinism—had ever kept UVB-76, as the station’s call sign ran, from its inscrutable purpose. During that time, its broadcast came to transfix a small cadre of shortwave radio enthusiasts, who tuned in and documented nearly every signal it transmitted. Although the Buzzer (as they nicknamed it) had always been an unknown quantity, it was also a reassuring constant, droning on with a dark, metronome-like regularity.

But on June 5, 2010, the buzzing ceased. No announcements, no explanations. Only silence.

The following day, the broadcast resumed as if nothing had happened. For the rest of June and July, UVB-76 behaved more or less as it always had. There were some short-lived perturbations—including bits of what sounded like Morse code—but nothing dramatic. In mid-August, the buzzing stopped again. It resumed, stopped again, started again. Then on August 25, at 10:13 am, UVB-76 went entirely haywire. First there was silence, then a series of knocks and shuffles that made it sound like someone was in the room. Before this day, all the beeping, buzzing, codes, and numbers had hinted at an evil force hovering on the airwaves. Now it seemed as though the wizard were suddenly about to reveal himself. For the first week of September, transmission was interrupted frequently, usually with what sounded like recorded snippets of “Dance of the Little Swans” from Tchaikovsky’s Swan Lake.
"Inside the Russian Short Wave Radio Enigma" (Wired)

"Spy vs. Spy" (bOING bOING Digital)

Listen to UVB-76