If you tune a shortwave radio to 4625 kHz right now, this is what you'll hear. A buzz. 1 second on, 1 second off, repeating. It has been doing this for 44 years. The signal comes from Russia. A military frequency that nobody has officially claimed. The transmitter [music] site was found by urban explorers in 2011, an abandoned base near St. Petersburg. With the radio [music] log confirming the frequency. The broadcast has since moved to a communications hub near Moscow. Since 1982, through the fall of the Soviet Union, through wars, through the rise of the internet, it has never stopped. [music] 24 hours a day, 7 days a week. The same buzz, the same frequency. But sometimes, without warning, [music] the buzz stops and a voice speaks Russian. A man reading names and numbers [music] in a flat military cadence. Then the buzz resumes as if nothing happened. Nobody knows why. [music] A military command network, a doomsday signal, an atmospheric monitor, >> [music] >> a Cold War relic that nobody remembered to turn off. Every theory is unconfirmed. In November 2025, a drone strike against [music] a nearby power station briefly knocked the signal off the air. The same month, [music] the most messages ever broadcast in a single day. In December, hackers played Swan [music] Lake over the frequency. The signal fought back. It is still going right now. 4625 [music] kHz. 44 years of a sound nobody will explain. You can tune in tonight [music] and hear it for yourself. The question isn't what the buzz means. The question is, what happens if it stops? [music] Like and subscribe, Grave File TV. New file every day.