FUN AND GAMES February 25, 2025

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

French diver Eric Blin, a water environment and coastline waste-management and biodiversity expert who is taking part in the 'sea@dvanced sound' project, checks a hydrophone off the coast of the Ajaccio, the capital of the French Mediterranean island Corsica on September 11, 2019.

The weather, ice, and animal categories are self-explanatory. But the geophysical category refers to events like underwater volcanic eruptions or earthquakes, while the anthropogenic category has to do with sounds made by ships and other human creations.

In Dziak’s words, “Anything else is usually just some kind of electronic interference with the signal.”

The search was on

Researchers leaving with the zodiac to collect material with detail of the mooring quay almost submerged by high tide and soil material for earthworks in the foreground, on December 27, 2019 in King George Island, Antarctica.

But since it was unclear which category the “bloop” fit into (if any), PMEL researchers set up more hydrophones in the region it was first detected.

According to the NOAA, those devices weren’t intended to find the source of the sound so much as to study the sounds of underwater volcanos and earthquakes.

Closer to the truth

Tourists and scientists visit the Base Y operating as a museum by the UK Antarctic Heritage Trust (UKAHT), established in 1950 and used by British scientists for 5 years, in Horseshoe Island, Antarctica on February 26, 2023.

But the closer those hydrophones were placed to Antarctica, the closer researchers came to discovering the true answer to the “bloop.”

And in 2005, the biggest clue to that answer finally came.

Listening closely

Antarctica, Iceberg In Bransfield Strait, King George Island Background.

As Dziak told Wired, researchers were particularly interested in the data they recorded from the Bransfield Strait and the Drake Passage.

Both of these water bodies are near Antarctica’s northwesternmost peninsula, and their sounds were subject to what Dziak called an “acoustic survey.”

A perfect match

View from the Brazilian Navy's Oceanographic Ship Ary Rongel as it goes through the Drake Passage on its way to Antarctica on March 2, 2014.

The NOAA’s acoustic survey went from 2005 to 2010, and by the time it was concluded, researchers were confident they had heard the same sounds that confounded the world in 1997.

The Good, The Bad, The Superugly

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

The search was on

Closer to the truth

Listening closely

A perfect match

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The search was on

Closer to the truth

Listening closely

A perfect match

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