Please answer the following question: HNLMS Zwaardvis (S806) -  Zwaardvis (Dutch: Swordfish) was a Zwaardvis-class submarine of the Royal Netherlands Navy. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Mean Of Transportation