What happened with the mysterious UVB-76 broadcast?

Russia’s infamous “Doomsday Radio,” officially known as UVB-76, broke its usual static and buzzing routine on Monday (September 8), transmitting two cryptic coded messages. The transmissions contained strings of letters and numbers, including the call sign “NZHTI,” previously used in May during a phone call between US President Donald Trump and Russian President Vladimir Putin.

The mysterious station, believed to be located about 18 miles from Moscow, has long been a subject of Cold War speculation.

Why is it called “Doomsday Radio”?

Since the 1970s, UVB-76 has transmitted a continuous low-frequency buzzing noise on shortwave radio. Occasionally, the buzz is interrupted by coded voice messages. Because of its Cold War origins and secrecy, many believe the station is tied to Russia’s nuclear command-and-control system — a fail-safe that could be activated if Moscow were attacked.

Other theories include:

• A “Dead Man’s Switch”: If the buzzing ever stops, it might trigger an automatic retaliatory nuclear strike.
• A military communications channel: Relaying encrypted orders to remote Russian outposts.
• More fringe ideas: A UFO beacon or even a mind-control device.

What did the latest messages say?

The September 8 transmission included the phrases “NZHTI” and “HOTEL,” followed by numbers such as 38, 965, 78, 58, 88, and 37. Like previous broadcasts, the meaning remains undeciphered.

Earlier this year, UVB-76 transmitted two similar coded bursts during the Trump-Putin call:

• “NZhTI 89905 BLEFOPUF 4097 5573”
• “NZhTI 01263 BOLTANKA 4430 9529”

While amateur radio enthusiasts captured and shared the audio, no one outside Russia’s defense circles knows their true purpose.

Expert opinions on UVB-76

Professor David Stupples, an electronic and radio engineering expert at City University of London, says the continued activity of the station suggests it is still serving a military role:

“If the Russian government is using ‘Doomsday Radio,’ it wouldn’t be for peaceful purposes. It has presumably been kept alive as a fail-safe in case of nuclear war.”

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Freelance radio monitor Ary Boender from Holland echoed long-standing speculation that it could act as an automatic deterrent against the West — though she notes the UFO and “mind-control” theories also thrive in conspiracy circles.

The long history of a Cold War enigma

• 1982: Researchers first documented UVB-76, noting its unusual beeps and buzzes.
• 1992: The buzzing became more structured, with 25 short bursts every minute.
• Post-2000s: Messages began to intersperse the static, typically strings of numbers and Russian names.
• Today: The station still operates, baffling listeners and fueling global speculation.

The fact that UVB-76 has never been officially explained only deepens the intrigue.

Why does it matter now?

The latest activity comes at a time of heightened geopolitical tension between Russia and the West. Each unusual broadcast sparks viral reactions online, with users comparing it to Cold War thrillers and questioning whether it signals a hidden escalation.

For security analysts, the persistence of UVB-76 underscores that some Cold War-era systems remain active, and potentially dangerous.