This is the only remaining building that Forth Ports at the time never managed to knock down, which was no surprise as it was originally built to sustain attack from German Bombers during the dark days of World War Two.
Built at the request of the Admiralty to help protect all the many ship plans and drawings that were required to build all the many warships such as Corvettes and Frigates for the Royal Navy during the six years of War.
They required a secure facility from the threat of fire from incendiary bombs dropped by German aircraft.
The building was constructed the same as a traditional riveted ship's superstructure complete with riveted seams and ships portholes.
Also used as a first aid station and latterly as a chemical/paint store it is just good to report that some use has been found for the building.