Its Cthulthu!
His very presence twists the laws of physics around so much it screams rape. There is no running away, for away will take you towards and towards will take you skywards... it is madness, MAAAAADNESSS.
PS: I learned of the bloop some time ago and only recently got curious if the location was plotted... it was. And where was it plotted too.... why within spitting distance of R'lyah. Scaaaaaary stuff. For those who don't know the bloop is a strange sound that was heard by three aqua-scopes, a underwater mic system designed in the cold war era to find subs. The three where 5000 Km apart, making it the sound so loud it has to have come from something much, MUCH, bigger then anything we have seen to date.