Unexplained Sounds & Signals Map
Window-rattling booms with no storm in sight, a low hum that never stops, trumpet-like sounds from the sky. This map collects reports of unexplained sounds and signals from witnesses and the news, pinned to where they were heard.
When several people report the same sound in the same area, it shows up here as a cluster. Add what you heard to help pin down the source.
Latest reports
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Report a SightingFamous cases
All case files →The Taos Hum
A low droning sound that only a small share of residents can hear. Scientists investigated in the 1990s and couldn’t find a source.
The Bloop
An extremely loud, ultra-low-frequency underwater sound was picked up by hydrophones thousands of kilometres apart, fuelling theories of a giant sea creature.
The Windsor Hum
For years a rumbling low-frequency hum rattled windows in Windsor, Ontario. Investigators traced it across the river to an industrial island in Michigan.
Frequently asked questions
What causes mystery booms?+
Common explanations include sonic booms from military aircraft, quarry blasting, meteors breaking up, frost quakes (cryoseisms) and distant thunder. Some remain unexplained.
What is "the hum"?+
A persistent low-frequency droning that some people hear in specific towns, such as Taos and Windsor. Proposed causes range from industrial equipment to tinnitus; many cases are unresolved.
How do I report a strange sound?+
Press Report a Sighting, choose Unexplained Sounds, pin where you heard it and when, and attach a recording if you have one.