Why did German naval architects not work with Italy as German tank designers worked in the Soviet Union?
Short answerGermany and Italy distrusted one another and competed over Austria during Bismarck's design period, leaving little basis for shared naval development.
NotesThe later Axis partnership should not be projected backward into the years when Bismarck was designed. Germany and Italy distrusted one another and competed over Austria. Hitler could not assume Italian support for expansion there, and neither state had the working relationship needed for shared naval design. Technical exchange depended on political alignment that did not yet exist.