John Richards of the Santa Barbara Co. Genealogical Society shared this information at my presentation at SBCGS on Saturday. The German National Archives is using microfilm and tunnel storage for the long-term preservation of their records, 855 million images to date, including Bach’s handwritten manuscripts, blueprints of the Cologne Cathedral, and Hitler’s certificate of appointment as Chancellor. 

Red vault sealing the entrance to the archives ©theworld.org
The Barbara Tunnels method may seem unbearably old school in today’s digital world, but I couldn’t agree more with their analog strategy. Read about it here.