The Bloop - and Cthulhu...

http://www.youtube.com/watch?v=OBN56wL35IQ&feature=youtu.be

http://naturalplane.blogspot.com/2012/06/what-was-bloop.html

Why there's no mystery at all folks, I know exactly what it was...

Ia!  Ia!   Cthulhu Fhtagn!!!