The Bristol Hum is a modern acoustic mystery reported by residents across parts of the city of Bristol UK, where a low, persistent droning sound is occasionally heard with no obvious source.

Described as a distant engine or industrial vibration, the Hum is most noticeable at night and has sparked debate for years, with suggested causes ranging from distant traffic and industrial activity to infrasound, atmospheric conditions, or even psychological perception effects.

Despite investigations, no single explanation has fully accounted for all reports, leaving it as one of the UK’s more intriguing contemporary sound phenomena.

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The Dark Glow of the Mountains by Chris Zabriskie is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/by/4.0/

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