This signal was received by nasa back in 1998 which was supposedly sent by a doomed planet 80,000 years ago.
I can't really find a reasonable source as every website which "use to" have a source is always down or the post has been deleted. This is the best I could find:
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STORY:
Original Article Found within the UK Ministry of Defence UFO Files
Recently the UK Ministry of Defence released to the National Archives the 7th batch of UFO Files.

Interestingly, One of those files features an article Published in the Weekly World News, (September 15, 1998 Vol 19 No. 51) with story about how NASA detected and decoded a mathematics based distress Signal from a doomed Planet outside our own Galaxy.

The signal was detected in January of 1998 however took many months to decode the message.

For your convenience the article has been transcribed:


NASA experts claim to have intercepted an intergalactic distress call from an alien civilization that had already peaked and was actually dying when saber-tooth tigers still roamed the earth!

The 80,000-year-old SOS was received and tape recorded in late January (1998).

But only in recent weeks have radio astronomers and lanuage experts found the key to the complex mathematics-based language that enabled them to translate the frantic plea for help.

The world press has been suspiciously silent about the startling message, though lengthy scientific reports are scheduled for publication in two professional journals, Radio Astronomy and Universe.

According to a highly placed NASA source in houston, noted Russian space scientist Victor Yulakow is leading a United Nations research team from a state-operated observatory 50 miles northwest of Moscow.

Dr. Kulakov told Universe that the signal emanated from a point beyond the galaxy nearest to our own Andromeda and was sent by beings that had apparently achieved a civilization no more advanced than our own here on Earth.

The simple fact that we received and decoded the message proves beyond any doubt that their knowledge and technology were, at the very best, within our reach. Dr Kulakov explained.

And while there are years of study ahead of us, I can say with certainty that the death of their civilization was not the result of some cosmic catastrophe. It was the result of the civilization turning on itself, possibly with devastating nuclear weaponry.

Dr Kulakov flatly refused to provide either of the magazines with a transcript of the message, but he did say it began with the plea, Help us, and went on to give data pinpointing the exact position of the doomed planet.

There was a quite lucid account of apocalyptic devastation, hellish explosions, widespread death and terminal illnesses, he said.

A Shower of meteors? Perhaps. But what stikes me, and this is just a feeling, is an underlying acceptance of guilt. Its as if the senders of the message are acknowledging blame for what happened.
Whatever it was, they apparently had no means to evacuate the remaining population. Interplanetary space travel was available to them, but only on a very limited level. The message makes it very clear that they were trapped on their world, said Dr. Kulakov.