see its become related to the mythic city of R'lyeh by fantasy and Lovecraft buffs; so it's not _really_ off topic.
Bloop wiki entry 
but doesn't it have a strange sort of harmony to it?  I actually enjoy listening to it, even if it is kinda weird creepy.
 
Bloop .wav file in realtime (click to listen)
Oh!  and with noise reduction too!
 
Bloop with noise reduction 
brings out its atonal yet harmonic qualities.  Sounds like something from Cthulhu to me.  Atonal harmony, non Euclidean geometry.