4. Berlin (1948-1949) By 1947, the United States placed as a high priority the revival of the German economy, an approach opposed by the Soviet Union. After the introduction of a Deutsche Mark the Soviet Union began to allow increasingly stringent checks on passenger and cargo flows travelling to the French, British and Aemrican sectors of Berlin, located in the heart of East Germany. This ultimately led to a blockade on all rail and road transport linking West Berlin, but an extensive airlift operation (Operation Vittles) allowed the city to survive. The Communists were however successful in staging a putsch in the Berlin municipal government, eventually leading to the divisions of both Berlin and Germany. Interviewees include Gail Halvorsen, Sir Freddie Laker and Clark Clifford. The pre-credits scene shows the Berlin airlift in operation.