Today I watched the movie "Titanic Case Closed"- National Geographic.
Tim Martin historian, sought information about the route which the Titanic sailed. Particular interest to him the sea water temperature (limit Labrador Current). In their search for documents, went to the Hamburg Sea Archiuwum. And there 37 000 logbooks of sailing ships and steamers of German from 1829. Pretty interesting story.
And I thought that the logs are available only in English