List of unexplained sounds

The following is a list of sounds, where the source of the sound remains unknown:

This list is incomplete; you can help by expanding it.

Specific

NOAA

The following unidentified sounds were detected by the USA National Oceanic and Atmospheric Administration using its Equatorial Pacific Ocean autonomous hydrophone array.

• Upsweep ('Upsweep' may have been tracked to an undersea South Pacific mountain that was not previously identified as a "live" volcano, although this is still unconfirmed.)
• Whistle ('Whistle' was only detected by a single autonomous hydrophone from the array.)

Formerly unidentified

• Bloop The NOAA identified the sound as "consistent with icequakes generated by large icebergs as they crack and fracture".

• Julia The NOAA reports that "The most likely source of the sound formerly known as “Julia” is a large iceberg that has run aground off Antarctica."

• Slow Down The NOAA reported that "it is highly probable that this sound was produced by a large iceberg as it became grounded."

• Train The NOAA wrote that the sound "was most likely generated by a very large iceberg grounded in the Ross Sea, near Cape Adare."

Other

• Colossi of Memnon
• Bioduck
• Quacker a sound claimed to have been reported by USSR submarines.^{[citation needed]}

Non-specific

• The Hum
• Mistpouffers
• Unexplained booms

See also

• UVB-76
• 52-Hertz whale