The Turtle Ship first appeared in 1413 (13th years of king Tajong reign) according to the record of history and was rebuilt as warship by Admiral Yi Sun Shin 1592.     Turtle Ship was equipped with Dragon's head and Turtle's body.     The roof of the Turtle Ship was covered with a sharp iron spikes which prevented enemy soldiers from boarding and the port holes were designed in order for the crew to look outside.      But the enemy could not see inside of the Turtle Ship.  The Ship rowed 16 oars and mode two sails, and the dragon-shaped head sent out smoke of burning sulfur powder in order to hide itself and confuse enemy fleet.     The ship was also equipped with 14 cannons.  The Turtle Ship was 37m long, 6.8m wide and weighed 150 tons, accommodating 130 to 150 soldiers.     The Turtle Ship was a product of the brilliant creativity of Admiral Yi Sun-Shin, who defeated the Japanese fleet during Imjinwaeran to save Chosun Dynasty in the times of danger.