The Seismic Underwater Explorer (SUE) is a marine seismic system which uses a mixture of oxygen and propane as an explosive source. The system is described and some typical results of its use are shown. In a development program over the past 2 years, power of the signal source has been increased and significant improvement of the signal-to-noise ratio of the system has been obtained. A major advantage gained through the development program has been to increase the penetration obtainable with the system. Present system capabilities are for penetration to depths of 10,000 ft. or more. Displays resulting from exploration work with the system are shown to demonstrate its usefulness as a prospecting tool for application in marine areas. The system is being used in many parts o the world to obtain reconnaissance seismic coverage and also to secure detailed information. Cost of surveys conducted with the SUE system is markedly lower than cost of conventional marine-seismic surveys, and consideration of exploration objective vs. survey cost vs. system advantages and limitations is a major factor in determining applicability of the SUE system in a particular prospect area.

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