great...we finally get a response from SETI and the listeners are texting.
Things that sound like this; The metal on metal shriek and groan of ships sinking (or how they make them sound in Hollywood movies.) Like some of the sounds of the alien ships in close Encounters. (Again, Hollywood.)
Elements of this sound occur when a Steel building is being torn down. I have heard this being done. WTC?
Whatever the sound is, it has more resonance and depth, and sustained longer than any of those sounds.