This is the fascinating history of the world's first military submarine - from the drawing board to final mission, and beyond. It is commonly thought that the military submarine made its first appearance during the American Civil War. However, during the American Revolution, one man responded to the threat posed by the British Navy - the most powerful in the world at the time - with amazing creativity and innovation. Without any formal training in engineering and only and rickety old shed to work in, David Bushnell designed and built the world's combat ready submersible. The Turtle, named for its appearance, moved at a mere three miles an hour, held only thirty minutes of air while underwater, and was complicated to operate. Focusing on the vessel's most important mission, sinking Britain's flagship in New York harbour, this concise history follows the development of the invention from drawing table to open water and onwards.