Bloop

[c3rmen]

In 1997 soviet submarines and a variety of detectors picked up a noise multiple times. It's real, its some sort of animal, and what ever the hell made it is much larger then a blue whale.

http://en.wikipedia.org/wiki/Bloop

Fun fact, check out the location of the bloop noise
http://stable.toolserver.org/geohack/geohack.php?pagename=The_Bloop_(unidentified_sound)¶ms=50_S_100_W_scale:40000000

now check out the point of where R'lyeh is supposed to be, where Cthulhu lies entombed
http://stable.toolserver.org/geohack/geohack.php?pagename=R%27lyeh¶ms=47_9_S_126_43_W_type:city&title=R%27lyeh+fictional+location+%28Lovecraft%29

cthulhu goes bloop apparently