Its inside is divided into two floors, one of which is the place where cannons are and the other is where people can row. There are twenty four rooms. Nineteen of them are where soldiers can take a rest. Other three of them are where some weapons, such as swords, arrows and spears, are. In the other three rooms, iron goods can be stored. On the bottom, there is a huge water tank, which can make "Turtle ship" float and sink.