Technological developments affecting naval warfare requirements and the demands of scientific programs have directed emphasis on structures in deep ocean areas. The over all objective of this manual is to provide information on environments, systems, and techniques relative to construction in such areas. This chapter contains data on buoys and deep-water anchorage systems, for the restraint of structures on the surface, on the bottom, and at intermediate levels. New concepts are considered, as well as extended uses of conventional shallow-water anchorages. Types and uses and the fabrication, installation, protection, and maintenance of promising systems are discussed from the standpoint of deep ocean applications. (Author).