密歇根州前海军基地 与神秘的低频"Hum"报告相关联 Former Navy site in Michigan linked to mysterious low-frequency "Hum" reports.

Humboldt场址是美军在密歇根上半岛的一个前海军设施,使用极长的天线通过低频信号与世界各地的潜艇进行通信。 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. 该网站于2004年退役,只能传送密码短信息。 Decommissioned in 2004, the site could only transmit short coded messages. 最近,它与“Hum”有关, 该地区报道了一个无法解释的低频率声音。 Recently, it was linked to "The Hum," an unexplained low-frequency sound reported in the area.