Science & anomalies
Bloop as an unknown giant animal
anomaly interpretationEvidence status
NOAA identifies an Antarctic icequake, not an animal.
Editorial assessment of this proposition; not a numeric confidence score.
Claim or proposition being examined
The powerful recorded ocean sound came from an enormous unknown creature.
Limitations
Source demonstrates circulation of the claim, not its truth; independently authenticated evidence is required.
Catalog review date reported: 2026-10-28. This is inherited catalog metadata, not a new verification of the linked source.

NOAA spectrogram of the 1997 Bloop recording. NOAA identifies its characteristics with icequakes; this is not an image of an animal. NOAA Pacific Marine Environmental Laboratory, Acoustics Program / Aspect-preserving resize only; no generative editing or cropping Original context source ↗
Image source record
Image rights and evidence limits
Image existence does not prove a linked claim. Consult image-specific captions and reuse conditions.
Sources and what they support
Links document the record, the claim’s circulation, an assessment, or reuse terms as labeled. A source link is not automatically corroboration.
- claim documentation and/or assessmenthttps://oceanservice.noaa.gov/facts/bloop.html
- NOAA spectrogram of the 1997 Bloop recording. NOAA identifies its characteristics with icequakes; this is not an image of an animal.https://www.pmel.noaa.gov/acoustics/sounds/bloop.html
- NOAA comparison spectrogram of iceberg calving. Supporting acoustics evidence, not the original Bloop recording or a cryptid.https://www.pmel.noaa.gov/acoustics/sounds/bloop.html
- NOAA comparison spectrogram of iceberg harmonic tremor caused by contact with the seafloor or another iceberg. Not the original Bloop recording.https://www.pmel.noaa.gov/acoustics/sounds/bloop.html
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- supported scientific explanation
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Supported by measurements; included separately from conspiracy claims, not an unresolved mystery.
- historical scientific hypothesis
Ozone depletion from descending nitrogen oxides
1986 observations of low nitrogen dioxide argued against this explanation.
