The Remotely Manned Undersea Work Systems developed at the Naval Ocean Systems Center (NOSC) are herein described. This paper begins with a description and analysis of typical underwater work tasks. Based on the function derived from the tasks analysis, various underwater transporters (vehicles or divers systems) will be described; the sensors required to locate and provide support at the work site will be discussed. Based on the various components required to perform underwater tasks thus delineated, systems synthesis is applied to provide the most efficient operations by best combining the complementary characteristics of each of the subsystems. The tasks defined and equipment described are applicable to most undersea operations such as survey, inspection, search, salvage, recovery of items from the seafloor, emergency rescue of submersibles or habitats, as well as performance of dexterous tasks on undersea installations. (Author).