# The Upsweep recording

> Long trains of narrowband sounds rising in frequency, seasonal, located roughly at 54°S 140°W. PMEL lists its origin as unresolved.

Source: https://mysteriesdept.com/mysteries/noaa-ocean-sounds/artifacts/ART0D9C7TF8459E/the-upsweep-recording  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[Mysteries](https://mysteriesdept.com/mysteries)[Bloop and NOAA's unexplained ocean sounds](https://mysteriesdept.com/mysteries/noaa-ocean-sounds)[Artifacts](https://mysteriesdept.com/mysteries/noaa-ocean-sounds#artifacts)The Upsweep recording

**ART** 0D9C7TF8459E·Artifact · recording

# The Upsweep recording

Recording0:29Public domainPresent from August 1991

[Cite][Download](https://mysteriesdept.com/files/d/9f52a7e0de2e73945c7b35883c5828c2dbd525acc97bb44e91adc1ff6bdcdb06)

0:00 / 0:29

 ![Spectrogram of The Upsweep recording](https://mysteriesdept.com/files/v/9f52a7e0de2e73945c7b35883c5828c2dbd525acc97bb44e91adc1ff6bdcdb06/spec)

0:00Spectrogram, 0 to 1.3 kHz0:29

Long trains of narrowband sounds rising in frequency, seasonal, located roughly at 54°S 140°W. PMEL lists its origin as unresolved.

NOAA Pacific Marine Environmental Laboratory, 1991. Public domain

## Copies 2

**Audio** NOAA Pacific Marine Environmental Laboratory · pmel.noaa.gov · Public domain (US government work)Primary source: [Acoustics Monitoring Program: Upsweep](https://mysteriesdept.com/sources/SRC0D9C712R2AJY/acoustics-monitoring-program-upsweep)2 steps from the original

[Where it's published](https://www.pmel.noaa.gov/acoustics/sounds/upsweep.html)[Download](https://mysteriesdept.com/files/d/9f52a7e0de2e73945c7b35883c5828c2dbd525acc97bb44e91adc1ff6bdcdb06)

**Document** NOAA Pacific Marine Environmental Laboratory · pmel.noaa.gov · Public domain (US government work)Primary source: [Acoustics Monitoring Program: Upsweep](https://mysteriesdept.com/sources/SRC0D9C712R2AJY/acoustics-monitoring-program-upsweep)2 steps from the original

[Where it's published](https://www.pmel.noaa.gov/acoustics/sounds/upsweep.html)[Download](https://mysteriesdept.com/files/d/167fea79db35642665e0ebba64da45d276a1e50e611d17a06dac664844be22fe)

## Where it was recorded

[Upsweep source region, about 54°S 140°W](https://mysteriesdept.com/records/PLC0D9C76Y81SWH/upsweep-source-region-about-54s-140w) · Open ocean (approximate location)

## Sources 1

- [Acoustics Monitoring Program: Upsweep](https://mysteriesdept.com/sources/SRC0D9C712R2AJY/acoustics-monitoring-program-upsweep)_SRC_

## Cite it

```
Mysteries Department. (2026). The Upsweep recording [Artifact ART0D9C7TF8459E]. https://mysteriesdept.com/r/ART0D9C7TF8459E
```

Key

**ART** 0D9C7TF8459E

Kind

Recording

Held by

NOAA Pacific Marine Environmental Laboratory

Dated

present from August 1991

Licence

Public domain (US government work)

Place

[Upsweep source region, about 54°S 140°W](https://mysteriesdept.com/records/PLC0D9C76Y81SWH/upsweep-source-region-about-54s-140w)

Part of

[Bloop and NOAA's unexplained ocean sounds](https://mysteriesdept.com/mysteries/noaa-ocean-sounds)

The record

Every record is open data. Take this one as JSON, with its links and its history.

[JSON](https://mysteriesdept.com/api/v1/records/ART0D9C7TF8459E)