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

"Decades Later: New Evidence Unveils the Mysterious Origin of the Ocean's 'Bloop' Sound—What Scientists Discovered Will Shock You!"

Catfishes, known as invasive species and increasing in number in recent years, living with hundreds of plastic waste at the bottom, are seen during the awareness dive of Sahika Ercumen, United Nations Development Program (UNDP)

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When Wired spoke to NOAA seismologist Robert Dziak, he made it clear that nobody tasked with uncovering the mystery behind the “bloop” seriously thought a giant animal was responsible.

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He also explained what led the public to believe otherwise.

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A misleading edit

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A diver is seen with stalagmite in Big Cave, Hatay, Turkiye on October 27, 2022.

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As Dziak told Wired, “What has led to a lot of the misperception of the animal origin sound of the Bloop is how the sound is played back.”

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By that, he meant that the noise commonly heard by the public was about 16 times the normal speed of the “bloop’s” original audio file, which made it sound like an animal cry.

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A lumbering rumble

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Lightning bolts strike One World Trade Center in New York City as it fans out over the Hudson River and Jersey City, New Jersey during a thunderstorm on April 1, 2023, as seen from Hoboken, New Jersey.

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Dziak further explained that when the sound was slowed down to its normal speed, it sounded more like an earthquake or a rolling thunderstorm.

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That meant that for NOAA scientists, the most likely explanation was that a sustained natural process was causing the “bloop.” They just had to figure out what it was.

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Some well-trained ears

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A hydrophone floats in the water off the coast of the Ajaccio, the capital of the French Mediterranean island Corsica on September 11, 2019 as part of the 'sea@dvanced sound' project.

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What made the “bloop” so exciting to researchers was the fact that it’s actually quite rare for the NOAA’s hydrophones to pick up a sound they didn’t recognize.

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As Dziak explained to Wired, almost every sound that comes in fits into one of five major categories: Geophysical, anthropogenic, ice, weather, and animals.

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