
The Noisy Plainfin Midshipman
There are many hazards of the sea. One of the least dangerous, yet still highly annoying and somewhat mysterious is the loud humming sound heard coming from the sea on summer nights by residents of coastal towns, in boats or in houses near the shore. The hum has been described variously as similar to the drone of a B-29 bomber or a giant electric shaver.
It is unclear how long this subsea hum has been keeping coastal dwellers awake, but in 1985, after complaints from houseboat dwellers in Sausilito, California, volunteers from a local aquarium found the answer.