Earth Kingdom ferry

The [Earth Kingdom] used ferries to secretly transpot refugees from a protected hidden port in [Full Moon Bay] to travel to [Ba Sing Se]. [Aang], [Katara], [Sokka], and [Toph] tried to travel to Ba Sing Se by ferries with [Than] and [Ying], but when their tickets were stolen, Aang descided to lead them through the [Serpents Pass]. [Zuko] and [Iroh] were able to gain access to get tickets for the ferry, and on their ferry, they meet [Jet], [Smellerbee], and [Longshot]. The ferries seem to have a simple structure with a large hull complete with captain, crew, and passanger quarters, a kitchen, and other important components of the vessel. For the vessel to move, the vessel uses a paddlewheel, but how the boat is powered is unknown. Since there are no smokestacks, the ships must use another form of power to move the vessels.