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The bloop that roared

10:46 PM ET (US)
If it was some kind of whale wouldn't it have to surface?
Eli the BeardedPerson was signed in when posted
05:46 PM ET (US)
Okay, so one biologist says "No gas sack, they can't make that noise."
That doesn't give me a lot of confidence that it couldn't be a cephalopod.
Consider: most giant squid have ammonia sacks that serve the dual
purpose of making them taste bad, and have a neutral bouyancy. Also
remember that some octopuses (and perhaps squid and cuttlefish, two
other cephalopods) swim by sucking in a lot of sea water and then
shooting it out. So these creatures often do have chambers that could
produce resonating noises, and if the desity was different enough from
the surrounding material, I bet it could sound like a gas sack.

Consider these squid:

And this octopus:

And this page has a video of a squid jetting (last on the page):
JIMWIChPerson was signed in when posted
03:35 PM ET (US)
So the giant squid says, "Here, pull my tentacle."
CraniacPerson was signed in when posted
10:46 AM ET (US)
Oddly, instances of the mysterious blooping noise tend to increase on Wednesday, when the entire lab staff goes to Chuck's Chili Barn for lunch.
Greg van EekhoutPerson was signed in when posted
11:24 PM ET (US)
Yeah, but what about the marine biologist who says squid don't bloop? Maybe it's something . . . weirder than a honkin' big squid.

From the CNN article:

However Phil Lobel, a marine biologist at Boston University, Massachusetts, doubts that giant squid are the source of Bloop.

"Cephalopods have no gas-filled sac, so they have no way to make that type of noise," he said. "Though you can never rule anything out completely, I doubt it."
Scientists from the U.S.'s NOAA have been baffled by the "Bloop" sound  

Nevertheless he agrees that the sound is most likely to be biological in origin. "

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