Sounding the Sumburgh Foghorn

The Sumburgh foghorn was used as part of the foghorn sound for Robert Eggers "The Lighthouse". Read more here - https://www.imdb.com/title/tt7984734/trivia?ref_=tt_trv_trv
A foghorn or fog signal is a device that uses sound to warn vehicles of navigational hazards like rocky coastlines, or boats of the presence of other vessels, in foggy conditions.
 Out of use since 1987, the foghorn was painstakingly restored by Brian Johnson. Shown in the video is the annual Foghorn sounding at Sumburgh Lighthouse, Shetland, Scotland.
Brian starts up the 1951Kelvin K-Series Diesel 44hp Engines. The engines power the Alley and MacLellan compressors, which in turn, power the foghorn.

Just so's you know, the horn was originally much louder at the end, but YouTube's audio algorithm turned the volume down. I tried several versions but it wasn't having it.

Видео Sounding the Sumburgh Foghorn канала JJ Jamieson