Connecticut also became an innovative leader in the shipbuilding industry. The first recorded steam powered boat in America was built by South Windsor's John Fitch in 1786. The first military submarine, the Turtle, was built in Connecticut in 1775 by David Bushnell; since then, Connecticut has remained a world leader in the manufacture of these specialized ships. Simon Lake produced submarines for the US Navy in Bridgeport, beginning in 1913, and the work done by John P. Holland led to submarine production by the Electric Boat Company in Groton beginning in 1924, which continues to this day.