The album Tubular Bells (with The Exorcist theme) accidentally contains morse code sent to UK military submarine

Mike Oldfield recorded the classic Tubular Bells in the early 1970s at Richard Branson's studio in Shipton-on-Cherwell, England. About an hour away from there was a huge wireless transmitter called Rugby Radio where, among other broadcasts, the UK government delivered very-low-frequency (VLF) transmissions to submarines. Turns out, a 16 kilohertz signal—Morse code of the station's call sign and the word "testing"—was inadvertently picked up by the recording gear at the music studio and made it onto Tubular Bells. As David Schneider explains, monitoring changes in VLF signals as they travel around the world can also be used to monitor space weather using just $70 of equipment and a laptop computer.

La noticia: https://boingboing.net/2022/01/24/the-album-tubular-bells-with-the-exorcist-theme-accidentally-contains-morse-code-sent-to-uk-military-submarine.html

El video:

https://youtu.be/PQaBF9_9C8I