Q:German submarine U-52 was a type VIIB U-boat of Nazi Germany's Kriegsmarine during World War II. She was initially ordered on 15 May 1937 in violation of the terms of the Treaty of Versailles and laid down on 9 March 1938 at the yards of F. Krupp Germaniawerft AG in Kiel as 'Werk 587. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Mean Of Transportation