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The vessel is a large hull built around a giant oarfish and is used to transport people more easily. The carriage has several oars sticking out of it.
Fish-Man Island Arc
While half of the Straw Hat Pirates were enjoying Mermaid Cove, Fukaboshi and his brothers arrived on the Ryugu. Sanji suddenly had a massive nosebleed. Luffy was worried and asked for a donor. When they ignored him, Camie stole the Ryugu from them and she, along with the Straw Hats, left in order to find a blood donor for Sanji.
- The writing on the carriage says 竜宮城 (Ryūgū-jō), meaning Ryugu Palace.