SM U-18 was one of 329 submarines serving in the Imperial German Navy in World War I. U-18 engaged in the commerce warfare in the First Battle of the Atlantic.Launched in October 1914 she was commanded by Kaptlt. von Hennig.On her third mission on 23 November U-18 penetrated the fleet anchorage of Scapa Flow via Hoxa Sound following a steamer through the boom and entering the anchorage with little difficulty. 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?
Answer:
Mean Of Transportation