Article online: German vs. Allied Codebreakers in the Battle of the Atlantic by Stephen Budiansky of the International Journal of Naval History In mid-November 1941, Admiral Karl Dönitz, the Nazi commander of U-boats, noted in his war log his puzzlement over the repeated failures of German submarines to find and sink Allied convoys in the Atlantic. “Accident does not fall on the same side every time,” he insisted; it just could not be a coincidence that the Allies always seemed to choose a course that steered clear of his waiting submarines. There had been other suspicious events, too...... More in this link: Article online of the International Journal of Naval History. For more informations, are depicted in this book: Jak P. Mallmann Showell, "German Naval Code Breakers". Jan.