Submarines

The first submersible of whose construction there exists reliable information of, was designed and built by a Dutchman named Cornelis Drebbel in 1620. It had Oars that stuck through leather seals and had snorkel hoses for air. The first military submarine was the Turtle which was built in 1775. It was a hand-powered acorn-shaped device designed to accommodate a single person. The Turtle was used during the American Revolutionary War.