# At least one of the sounds came from human activity (military exercises, ships, winches or other machinery).

> Disputed: At least one of the sounds came from human activity (military exercises, ships, winches or other machinery).

Source: https://mysteriesdept.com/mysteries/noaa-ocean-sounds/answers/ANS0D9C7FZA5QEB/at-least-one-of-the-sounds-came-from-human-activity-military  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Bloop and NOAA's unexplained ocean sounds](https://mysteriesdept.com/mysteries/noaa-ocean-sounds)[What made the loud unidentified sounds recorded by NOAA's Pacific hydrophones in the 1990s?](https://mysteriesdept.com/mysteries/noaa-ocean-sounds/questions/QST0D9C7CA41BJB/what-made-the-loud-unidentified-sounds-recorded-by-noaas)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).

**Disputed** Answers **1** questionPublished0

## Where it stands

**Disputed** None 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

[PMEL catalogues ship and airgun sounds separately and does not class any named sound among them.](https://mysteriesdept.com/mysteries/noaa-ocean-sounds/evidence/EVD0D9C7GEY33RQ/pmel-catalogues-ship-and-airgun-sounds-separately-and-does)

Suggestive

AGAINST

[The Bloop's bearing points between Bransfield Strait and the Ross Sea, far from shipping lanes.](https://mysteriesdept.com/mysteries/noaa-ocean-sounds/evidence/EVD0D9C7G745WX2/the-bloops-bearing-points-between-bransfield-strait-and-the)

Supported

AGAINST

## The questions it answers

[What made the loud unidentified sounds recorded by NOAA's Pacific hydrophones in the 1990s?](https://mysteriesdept.com/mysteries/noaa-ocean-sounds/questions/QST0D9C7CA41BJB/what-made-the-loud-unidentified-sounds-recorded-by-noaas)

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
```

Key

**ANS** 0D9C7FZA5QEB

Kind

Answer · hypothesis

Origin

Published

Version

1

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