QuestionsBloop and NOAA's unexplained ocean soundsWhat made the loud unidentified sounds recorded by NOAA's Pacific hydrophones in the 1990s?Answer
Answer · Bloop and NOAA's unexplained ocean sounds
At least one of the sounds, most often the Bloop, was made by a large animal, known or unknown.
At least one of the sounds, most often the Bloop, was made by a large animal, known or unknown.
Where it stands
DisputedOne piece of evidence for, two against. It needs two reviews to be accepted.
What it predicts
- The sound has the harmonic structure and repetition of animal calls.
- Source levels are within the physiological range of a living animal of plausible size.
What would rule it out
- A source level far beyond any animal, or a match to an ice or volcanic signal recorded with the source observed.
Evidence 1 for · 2 against
AGAINST
The questions it answers
Most likelyAll of them are natural geophysical or cryogenic sounds (icequakes, grounding icebergs, volcanic eruptions…
Cite it
Mysteries Department. (2026). At least one of the sounds, most often the Bloop, was made by a large animal, known or unknown. [Answer ANS0D9C7F024MPX]. https://mysteriesdept.com/r/ANS0D9C7F024MPX
@misc{mysteriesdept_ans0d9c7f024mpx,
title = {At least one of the sounds, most often the Bloop, was made by a large animal, known or unknown.},
author = {{Mysteries Department}},
year = {2026},
note = {Answer, catalog key ANS0D9C7F024MPX},
url = {https://mysteriesdept.com/r/ANS0D9C7F024MPX}
}