Q:HMS K5 was one of the K-class submarines that served in the Royal Navy from 1917-1921. She was lost with all hands when she sank en route to a mock battle in the Bay of Biscay. 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