Answer:
On 26 June 1948, Western allies started a massive airlift to counter the Berlin blockade imposed by the Soviet regime. The film, “Background to Berlin”, produced in 1962, explains how this happened.
More broadly, it tells the story of the city of Berlin from the end of World War II to the building of the Berlin Wall in 1961. It traces the origin of the Allied rights in Berlin, shows how the city came to be divided, and relates the problem of Berlin in the larger context of German reunification. It also explains why the fifteen NATO members supported the defence of West Berlin's freedom in front of Soviet pressure.
