It may just be the last thing audiences will see before CNN signs off at the end of days - in case of a devastating nuclear war, an extinction-causing great flood or hell freezing over.

A writer for the Web site Jalopnik, Michael Ballaban, found a one-minute video that the news network will apparently run when the world ends. Ballaban used to be an intern with CNN's The Situation Room with Wolf Blitzer.

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He said the video was in storage, with a note to hold its release until the end of the world was confirmed.

CNN's founder Ted Turner once told a New York magazine that unlike other television networks, the 24-hour cable channel will only sign off once, most probably on doomsday. So the network got the U.S. Armed Forces marching bands play together - the Navy, Army, Air Force and Marine bands - in front of the old CNN office. They were recorded playing the national anthem and the theme 'Nearer, My God, to Thee' that will be broadcast when the world meets its demise.

When CNN was launched in 1980, Turner vowed the network would not sign off until the world ended.

Ballaban declined to identify the source of the video. He said that while he knew the video existed, he only managed to get a copy when he left the network. He wondered what if CNN is down to its last employees alive, in its remaining bureau in the world, with whom were they supposed to confirm the end of the world.

The former network intern told a New York newspaper that there was no critical reason for uploading the video now and that he did hear from other former employees of CNN about it. Ballaban was surprised it took so long for the video to surface.

CNN declined to deny or confirm the video's authenticity.