J.L. Lambot's crude ferrocement rowboats built in France in 1848 left a legacy that advances today with modern concrete technology. Of necessity concrete ships were pressed into service in World War I. The success of the 3,000-ton freighter Atlantus gave marine engineers to prepare designs for larger vessels, such as the 7,300-ton tanker Selma. A steel shortage during World War II revived concrete ship construction. Nervi, a famous Italian engineer and architect invented "ferrocement," layers of mortar reinforced with wire mesh. Opportunities abound for concrete use in a marine environment today.