They basically cut off transportation along what is the Autobahn from West Germany into West Berlin, hoping that the allies would just give up on West Berlin and give it back to the Soviets who are forming the Warsaw Pact, the Eastern Bloc, their own kind of ally system. But of course the Berlin Airlift is going to avoid that as we fly supplies and drop them into West Berlin. And we're kind of like a hair trigger away from a war here all over Berlin. So when that finally fails in 1949, the Berlin Airlift succeeds. And Stalin realizes that West Berlin is not going to be in his bucket list here. So in 1949, following the success of the Berlin Airlift, I think Stalin made a conscious decision, OK, we're not going to get West Berlin. We're going to have to create our own state and go it alone.