The Rotterdamsche Droogdok Maatschappij (RDM), was the largest pre-World War II shipbuilding and repair company in Rotterdam in the Netherlands, existing from 1902 to 1996.[1] It built 355 mostly major seagoing vessels, 18 of which were submarines.[2] During its existence, the wharf operated 12 floating docks and in its heyday employed 7,000 people at one time.