Much of their work remains classified to this day – despite it closing in the 1980s.
Now a building that was home to so many secrets is about to be transformed.
A Fife couple, who bought the land in Cupar 2012, have been given planning permission to turn it into a stunning private home, with lodges added to the ground.
And since their plans ARE in the public domain, we can bring you images of the former wireless telegraphy HQ without suffering the wrath of the MoD!
. Secret listening station to become new home
The listening station was once a place where 120 people worked ... but many of their duties remain classified to this day Photo: na
. Secret listening station to become new home
Inside the former listening station - the building has been empty since the 1980s Photo: na
5. Secret listening station to become new home
The door to the former secret listening station Photo: NA
6. Secret listening station to become new home
An artist's impression of how the building could look after its transformation Photo: na
7. SSFF-12-10-20-ListeningStation9-SCOTupload.jpg
How the station could be transformed - a view from the hall into the living area Photo: Secret listening station to become new home
8. Secret listening station to become new home
The proposed re-design of the building looks stunning Photo: na