It loosely follows the history of the Berlin Tunnel (Operation Gold, covername: PBJOINTLY), which was built and run jointly by the CIA and the British SIS.
Berlin | Berlin Wall | Queen Mary | Mary | West Berlin | Mary, Queen of Scots | Mary I of England | Humboldt University of Berlin | Irving Berlin | Mary J. Blige | Mary Shelley | Mary Poppins | Mary Pickford | East Berlin | Mary of Teck | RMS Queen Mary | Free University of Berlin | Berlin Philharmonic | Mary Magdalene | Mary Robinson | Monterey, California | Mary Landrieu | Monterey | Assumption of Mary | The Mary Tyler Moore Show | Deutsches Symphonie-Orchester Berlin | Mary (mother of Jesus) | Monterey Bay | Mary-Kate Olsen | Deutsche Oper Berlin |