The source of the Olympia’s hum have been unsuccessful, although idling trains, pressure washers and heat pumps have been suspected. The mysterious, low frequency noise occurs typically between 10:30 p.m. and 3 a.m and is becoming a big problem. – The Olympian
Strange humming sound in Olympia, Washington – April 18 2014
Olympia residents are getting tired of being awakened overnight by a mysterious humming sound!
[…] Strange humming sound in Olympia, Washington – April 18 … […]