National Geographic - Great Escape: The Final Secrets (2009)

For 60 years American intelligence steadfastly refused to declassify the work of unit known simply as MIS-X. At last its extraordinary story can be told. The program reveals how MIS-X trained US pilots to send back coded messages if captured by the Germans, how the unit disguised maps, compasses, radios and even guns inside humanitarian parcels. Every captured American soldier or airman knew it was his obligation to try and escape. "Great Escape: The Final Secrets" shows how those men received enormous assistance from a group so secret that the US military ordered all records to be destroyed and its contribution erased from the pages of history.
A single line in the Washington Post spoke of a flagpole being raised at Fort Hunt, Virginia to commemorate a unit from WWII whose role remained classified. That seemed hard to believe. What could possibly still be secret after 60 years? This documentary reveals the flag's hidden significance. At Fort Hunt a clandestine organization linked US Army intelligence to prisoners inside 32 German prisoner of war camps. Hidden messages smuggled inside humanitarian packages, cameras to create false ID's and cribbage boards with hidden shortwave radios that picked up the BBC were all sent into the camps. The broadcaster relayed top secret messages in its 1am bulletin. This is the unknown story behind the Great Escape.