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Former Navy site in Michigan linked to mysterious low-frequency "Hum" reports.
The Humboldt Site, a former US Navy facility in Michigan's Upper Peninsula, used extremely long antennas to communicate with submarines worldwide through low-frequency signals.
Decommissioned in 2004, the site could only transmit short coded messages.
Recently, it was linked to "The Hum," an unexplained low-frequency sound reported in the area.
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Antiguo sitio de la Marina en Michigan vinculado a misteriosos informes de baja frecuencia de "Hum".