Naval Vessel (軍艦, Gunkan, lit. "Warship") is an archetype of WATER Machine monsters created by The Nepfessor at the request of Imperial Kozak. It is based on various historical Ships and Ship Classes around the world. They focus on mass Summoning monsters from their hand, while providing mass searching to get their Ritual, Grave and Annotee members. The deck focuses on you having no cards in the Extra Deck, and punishing opponent's monsters that use the Extra Deck.