The objective of this manual is to provide information on environments, systems, and techniques relative to construction in deep ocean areas. Developments in Naval warfare have placed emphasis on the deep ocean areas as an operating environment; consequently, in support of these operations, there is a need for knowledge concerning methods of construction in the deep ocean. It is realized that these methods can differ markedly from those used in construction on land; therefore, in this relatively new field many deficiencies exist which can be reduced only by research and development. This will require considerable time; however, in the interim, construction must continue. Toward making this as effective as feasible, existing information has been reviewed and digested, and is presented in this manual. Information has been provided by scientists, engineers, and offshore operators; especially those engaged in petroleum production. Deep ocean construction is a logical extension of the responsibility of the Bureau of Yards and Docks for construction of Naval facilities. This manual should assist in meeting this responsibility by providing engineers, constructors, planners, and others engaged in deep ocean construction with pertinent information. (Author).