Julia'sound'

This sound was recorded on March 1, 1999 on the eastern equatorial Pacific autonomous hydrophone array. The most likely source of the sound formerly known as “Julia” is a large iceberg that has run aground off Antarctica. Due to the uncertainty of the arrival azimuth, the point of origin could be between Bransfield Straits and Cape Adare with an origin time of 1999 JD60 21:05GMT. (Same as slow-down sound, iceberg grounding on seafloor.)
But also in this theory, people are not sure

[devin-sandeepchaosoverlord]

That’s scary dude. Imagine seeing that

[theelucidations]

It sounds like bird watcher and looks like cthlulu