One of these is in a part of Berlin called Charlottenburg, on the roof of a hotel at Steinplatz: the temporary site of U-boat Command, recently moved there from Paris. Most of these messages are signed by Grand Admiral Karl Dönitz. Waterhouse knows that Dönitz has recently become the Supreme Commander-in-Chief of the entire German Navy, but he has elected to hold onto his previous title of Commander-in Chief of U-boats as well. Dönitz has a soft spot for U-boats and the men who inhabit them.