During the mid-1980s, the residents at the north end of San Francisco Bay began complaining about a strange droning noise coming from the Bay. During the months of July and August, the odd noise started after sunset and continued until sunrise. People living on houseboats found that the noise disrupted their sleep.

Ref: John E. McC. 1986. "In Sum, it was Some Hum." Discover, June, pp. 67-71. Photo: Oyster Toadfish NOAA (PD)

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