Some suggested that it might have been caused by ship engines or even fishing boat ... melting into the sea. Debunking the ...

Is it a fish? Is it a sea monster? Is it Cthulhu ... The sound came to be called “the bloop” and remained a mystery for more than a decade. Like everyone else on the planet, the PMEL researchers ...

Miles below, a deep-sea fish approached the camera’s bait then, changing its mind, swam backward to escape. The footage turned out to be a first-of-its-kind sighting — but it wasn’t the last.