Sometimes it gets so loud you have to talk above it. For reasons no one understands, the noise can be heard only from about 8 p.m. until sunrise, and it goes silent from late September until mid-April, when it begins humming again through the summer. Acoustical engineers from Berkeley could not pinpoint the source of the sound with the help of instruments and a diver.
Biologists believe the noise is made by the singing toad-fish, also called the plainfin midshipman.
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