A mysterious radio station that has broadcasted a monotone buzzing sound and the occasional odd voice for decades has left scientists baffled.

The shortwave radio station, found on frequency 4625 kHz, has been running for at least 50 years. It has been appropriately nicknamed 'The Buzzer'.

But rumors as to its origins continue to swirl online today.

One alarming theory is that the sound is a signal which, if ceases, indicates a nuclear attack is imminent. Others say the buzzing sound is a foreign government's attempts to communicate with visiting alien species.

However, the most common theory among experts is that the radio waves come out of Russia, which may be reserving the frequency for an impending emergency...