"Fogbank" is the codename for a specialized material used in thermonuclear weapons (hydrogen bombs). Its existence was highly classified for decades.
By the year 2000, the U.S. needed to refurbish aging warheads. There was just one problem: nobody knew how to make Fogbank anymore. The original plant had been decommissioned. Key records were missing or incomplete. The "tribal knowledge" of the original scientists was gone. fogbank sassie 2000 302
or "Sassie" (Marine or Industrial Equipment) "Fogbank" is the codename for a specialized material