UM05 is the name of a mysterious radio station that broadcasts on shortwave at a frequency of 7542.8 kHz in CW. This station began its transmissions in January 2024 and has never identified itself with an official and/or ITU standard callsign. This station is also difficult to describe because it has a randomly definable transmission format. It transmits single letters in Morse code slowly for periods that can vary from a few minutes to a few hours, then starts transmitting words in French [“leon”, “pause”, “discussion”, “neige”], and then returns to transmitting single letters. At times, it transmits entire verses from the Book of Revelation or the Book of Apocalypse,…