“Decades Later: New Evidence Unveils the Mysterious Origin of the Ocean’s ‘Bloop’ Sound—What Scientists Discovered Will Shock You!”
Only half-kidding

As Wired reported, some horror fans were excited to point out that the point of origin for the “bloop” was just over 1,000 miles from where author H.P. Lovecraft envisioned the sunken city of R’yleh.
For those unaware, that city was where the infamous mythical creature Cthulu was supposed to be held. And while most of these horror aficionados weren’t seriously suggesting an escaped Cthulu was causing havoc near the South Pole, it was an attractive thought.
Alternate theories start to surface

While theories that attributed the sound to mysterious sea life were certainly popular, others didn’t feel that a plausible explanation for the “bloop” required the invention of a new species.
For them, it was more likely that researchers uncovered the sonic side effects of a secret underwater experiment by one of the world’s many military forces.
Far more mundane explanations

According to the NOAA, some explanations put far more common vessels as the source of the “bloop.” For some individuals, ship engines or even the winches on fishing boats could have made the sound.
But considering how far-reaching and loud the sound was, such explanations severely overestimated how noisy either of those devices is capable of being.