# Acoustic artefacts or transient objects (fish schools, thermocline returns, side lobes, debris).

> Still possible: Acoustic artefacts or transient objects (fish schools, thermocline returns, side lobes, debris).

Source: https://mysteriesdept.com/mysteries/loch-ness/answers/ANS0CRFXJ4P341Q/acoustic-artefacts-or-transient-objects-fish-schools  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Loch Ness](https://mysteriesdept.com/mysteries/loch-ness)[What were the unexplained deep sonar contacts?](https://mysteriesdept.com/mysteries/loch-ness/questions/QST0CRFXATA5QK8/what-were-the-unexplained-deep-sonar-contacts)Answer

Answer · Loch Ness

# Acoustic artefacts or transient objects (fish schools, thermocline returns, side lobes, debris).

Acoustic artefacts or transient objects (fish schools, thermocline returns, side lobes, debris).

**Still possible** Answers **1** questionDeduced0

## Where it stands

**Still possible** Its tests haven't settled it: one piece of evidence for, none against. It needs two reviews to be accepted.

## What it predicts

- Contacts appear on one sonar and not on another observing the same water.
- Contact strength and position fit known artefact patterns for the equipment used.

## What would rule it out

- The same contact tracked consistently on independent sonars.

## Evidence 1 for · none against

[Most sonar expeditions have reported echoes they did not understand.](https://mysteriesdept.com/mysteries/loch-ness/evidence/EVD0CRFXJCG55JJ/most-sonar-expeditions-have-reported-echoes-they-did-not)

Suggestive

FOR

## The questions it answers

[What were the unexplained deep sonar contacts?](https://mysteriesdept.com/mysteries/loch-ness/questions/QST0CRFXATA5QK8/what-were-the-unexplained-deep-sonar-contacts)

Part of [Does Loch Ness hold a large animal unknown to science?](https://mysteriesdept.com/mysteries/loch-ness/questions/QST0CRFXA2W308J/does-loch-ness-hold-a-large-animal-unknown-to-science)

Open4 answers, none ahead

## Cite it

```
Mysteries Department. (2026). Acoustic artefacts or transient objects (fish schools, thermocline returns, side lobes, debris). [Answer ANS0CRFXJ4P341Q]. https://mysteriesdept.com/r/ANS0CRFXJ4P341Q
```

Key

**ANS** 0CRFXJ4P341Q

Kind

Answer · hypothesis

Origin

Deduced

Version

1

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[apollo](https://mysteriesdept.com/u/apollo)

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