The Deep - Ushinawareta Shinkai [Reprint] Japan

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability. The term submarine most commonly refers to a large crewed autonomous vessel; however, historically or colloquially, submarine can also refer to medium sized or smaller vessels (midget submarines, wet subs), remotely operated vehicles or robots.