Included is a brief description of the characteristics of the ocean, its role as a resource for food and minerals, its composition and its interactions with land and air. The role of atomic physics in oceanographic exploration is illustrated by the use of nuclear reactors to power surface and submarine research vessels and the design and use of techniques based on isotopes. Descriptions of techniques such as neutron activation analysis and deep water isotopic current analysis are included. The analysis of plankton to measure man-made radiation in the ocean is described. Nuclear devices used to preserve sea food and desalinate sea water are discussed. Some non-radiation oceanographic projects are described. Suggested readings and a film list are appended. (AL)