Please answer the following question: Soviet submarine K-219 -  K-219 was a Project 667A Navaga-class ballistic missile submarine (NATO reporting name Yankee I) of the Soviet Navy. She carried 16 (later 15) SS-N-6 liquid-fuel missiles powered by UDMH with IRFNA equipped with an estimated 34 nuclear warheads.K-219 was involved in what has become one of the most controversial submarine incidents in the Cold War. 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