Have you listened to them?
Michael
Haven't been following this thread properly but if he is talking about the unknown artefacts then I would like to ask.
Has anyone tried looking for signal frequencies outside of human hearing?
The commonly stated range for human hearing is around 20Hz to 20kHz
What if the artefacts are playing audio that we can't hear?
Just because we can't hear it, it doesn't mean it's not there.
There are many frequencies that we can't hear, what if there is an alien race that communicates outside our hearing range?
Just an idea, sorry if it's pretty terrible.
If someone has already tried then apologies.