Greytown Noise
Level 1 – Surface Web
A strange unexplained audiophenomena that was heard until the turn of the 20th century. “[W]hile at anchor in this situation, we hear, commencing with a marvellous punctuality at about midnight, a peculiar metallic vibratory sound, of sufficient loudness to awaken a great majority of the ship’s crew, however tired they may be after a hard day’s work.” See Also Yellowstone Lake Whispers
LINKS
https://www.futilitycloset.com/2011/02/03/thegreytownnoises/