Well if you were an American soldier in Poland, trying to get home after a nuclear war, the best way, would be to make your way to the Baltic sea coast, and to find or build a ship or boat that will take you across the Atlantic, in an era of fuel shortages, a sail boat would have unlimited range. The trouble is, you might not know what's waiting for you in America and whether it would be better than any place in Europe. I think making a phone call might be out of the question, a ham radio might be a good way to find out what's going on back in the states.