During an unsuccessful expedition into the lowest levels of the Ruins of Alph, communication with the Unown was made via radio transmissions. Though most of this conversation was lost, this photo from a camera, as well as a translated snippet of dialgoue from the Unown was found on an old hard drive.
Apparently, a catastrophic incident occurred on this lowest floor known as the “Azoth Incident”, that caused scientists to seal off the bottom floor, and never speak of it again.