Note: TOP SECRET commercial shipping might operate along this route, its primary use at this stage would be to carry supplies to the forward areas and so relieve some of the strain on rail and road communications. The East German/Polish Canal Systems, which connects the Dnieper to the Elbe and has additional outlets at Stettin and Danzig, would undoubtedly be used to supplement the routs at (a) and (b) above. (c) Dardanelles-Sea of Marmora. Bosphorus. Although this stretch of water would not be available at the outbreak of war, it would be a vital link in the communications supporting operations in Anatolia, which the Soviet leaders would hope to start fairly soon after the outbreak of war.