Please answer the following question: The Philomel-class gunvessel was a class of wooden-hulled screw-driven second-class gunvessels built for the Royal Navy between 1859 and 1867 of which 26 were ordered but only 20 completed. They had a mixed history with some serving for as little as 5 years and others surviving into the 1880s. Two of the class were sold and used as Arctic exploration vessels both eventually being lost in the ice. 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