In two world wars, the Battle of the Atlantic has been narrowly won by the Allies. In the unhappy event of a third Battle of the Atlantic, victory or defeat may well depend on who controls that narrow, shallow, island- dotted sea area which lies between the Baltic and the North Sea, known as the Danish Straits.
The problem itself is simple. The Soviet Baltic Fleet has been variously estimated to number at least ninety, perhaps as many as 130 submarines. Such types in such numbers denote an offensive mission. As time goes by, some of these submarines will probably be nuclear-powered and missile-equipped. The important question is, can these submarines break out of the Baltic and into the Atlantic in the event of war?