Turtle ship is a warship built by Admiral Yi Sun-sin during a Japanese invasion of Korea in 16th century, Joseon Dynasty, and used to defeat the Japanese Navy. Because it looked like a turtle, it has been called "Turtle ship."
It has a dragon-shaped head, which can fire cannons through its mouth. Its tail can also fire artillery. "Turtle ship" has 12 cannons in each side, so total cannons are 24. As lots of iron nails are stuck in its back, nobody can approach it easily. Moreover, people who are in the "Turtle ship" can see the outside, while exterior people cannot look into it.
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.

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