Photography is demonstrated to be an effective tool in oceanographic investigation, especially for the study of water motions, marine biological organisms and sea-floor geological formations. However, the underwater environment presents many unique and difficult technological problems. A number of examples of how new photo-graphic techniques have been successfully used to record oceanographic phenomena are presented. These include studies of the movements of sea-surface slicks, surface waves, internal waves, turbulence, water turbidity, marine organisms, sea-floor relief, and the operation of equipment underwater. Still new photographic tech-niques are needed in these and other ocean-ographic studies.