It is interesting that other members have pointed out the inevitable references to the Cthulhu mythos, especially given the fact that the locations of
'Bloop' and Lovecraft's sunken city of R'lyeh are astonishingly close together.
Although it appears as though giant octopi or squids are unlikely candidates, according to Marine Biologist Phil Lobel who points out that
Cephalopods have no gas-filled sac, so they have no way to make that type of
noise.Reference - CNN
Although he does state that it is very likely biological in origin. I have heard many explanations for Bloop before, ranging from it being an undersea
earthquake to a group of whales communicating over vast distances and giving the impression of a single large creature.
Of course, given the difficulties inherent in monitoring and cataloging all forms of life at the depths of the oceans, the possibility of it being
some hitherto undiscovered, enormous marine animal is at least within the bounds of extreme possibility.
Edit to Consider:
The fact that Bloop has not been heard from since its initial discovery is interesting. This would initially lend credence to the sound being
non-biological in origin, since it is reasonable to assume that if there is something down there, it would vocalise more than once a decade. However,
given that the array which detected it was designed to spy on Russian submarines, perhaps we simply aren't listening as intently with the end of the
[edit on 27/8/08 by Jeremiah25]