The submarine looked like a turtle cause the inventor of it thought it was a good idea. Believe it or not it actually worked. The inventors name that invented it was David Bushnell, the reason he built this was because the british army wanted him to. In specific it was General Howe and Admiral Lord howe sailed to New York to find help. So the person they found was david Bushnell.
David Bushnell was so smart. He built the Submarine in a specific way. When the submarine is submerged underwater it only has 30 minutes of an air supply.