Ключевые слова: aquatic, deep sea, defense, defense forces, defense technology, exploration, illustration, illustration art, machinery, marine, maritime, military, nautical, naval, naval forces, navy, ocean, oceanography, periscope, sea, security, silent service, sonar, stealth, submarine, submerged, submersible, tactical, technology, torpedoes, underwater, underwater exploration, underwatercraft, vessel, warfare, warship,