---
title: The Bloop and the Sounds of the Deep
description: "In 1997, NOAA hydrophones detected an ultra-low-frequency sound of extraordinary power emanating from the South Pacific. For years it was unexplained. Then geology provided an answer — but the ocean had more mysteries waiting."
url: https://decodingtheunknown.pub/article/the-bloop.md
canonical: https://decodingtheunknown.pub/article/the-bloop
datePublished: 2026-05-28T00:00:00.000Z
dateModified: 2026-05-28T00:00:00.000Z
author:
  - name: Simon Whistler
    url: https://decodingtheunknown.pub/author/simon-whistler
publisher: Decoding the Unknown
image: "https://images.unsplash.com/photo-1545605114-7b82dad7b990?w=1200&q=80"
type: Article
contentHash: 2deae1fc19d0e0883c7c5164d3f84bf8a77d3d8c3e3a58e19fa149968230e43a
tokens: 57
summaryUrl: https://decodingtheunknown.pub/article/the-bloop.md.summary.md
---

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In 1997, NOAA hydrophones detected an ultra-low-frequency sound of extraordinary power emanating from the South Pacific. For years it was unexplained. Then geology provided an answer — but the ocean had more mysteries waiting.
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