Ships have been an integral part of humanity forever. Even very primitive tribes use boats and canoes. There are many kinds of these vessels to imagine wooden, aluminum, and steel. Even concrete ships floated around the world. The wreck of one called the SS Atlantus can be spotted in Cape May, New Jersey. The SS Atlantus is probably the most famous concrete ship. She was built by the Liberty Ship Building Company in Georgia and was the second concrete ship constructed in the World War I Emergency Fleet. SS Atlantus was a 260 feet long cargo ship powered by a steam engine. SS Atlantus could swim at speeds up to 10.5 knots, about 12 mph. The steamer was launched on December 5, 1918.