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 came from human activity (military exercises, ships, winches or other machinery).
At least one of the sounds came from human activity (military exercises, ships, winches or other machinery).
Where it stands
DisputedNone pieces of evidence for, two against. It needs two reviews to be accepted.
What it predicts
- The bearing points to shipping lanes or naval exercise areas.
- The signal shows mechanical periodicity or harmonics tied to engine speeds.
What would rule it out
- Bearings that point only to remote high-latitude coasts, as given for the Bloop, Train and Julia.
Evidence none 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 came from human activity (military exercises, ships, winches or other machinery). [Answer ANS0D9C7FZA5QEB]. https://mysteriesdept.com/r/ANS0D9C7FZA5QEB
@misc{mysteriesdept_ans0d9c7fza5qeb,
title = {At least one of the sounds came from human activity (military exercises, ships, winches or other machinery).},
author = {{Mysteries Department}},
year = {2026},
note = {Answer, catalog key ANS0D9C7FZA5QEB},
url = {https://mysteriesdept.com/r/ANS0D9C7FZA5QEB}
}