Wet Unit Weight (gn/ cc), The bulk dernlty of the edhiient-measured to the 'ecrest tenth by means at'war weight per known volume of sediment. Water Content (%): R•atio In percent of the weight of water to the weight of the dried solid particles In a given sediment mass. Void Ratio (a): The ratio between the volume of voids (Vv) and the volume of V V 5 12 t~ 'Con~ored with f IQUMe 12.

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This report presents the results of visual and photographic underwater surveys from the shoreline to a depth of 600 feet along selectedi routes off the eastern coast of Andros Island, Bahamas. Additional oceanographic and meteorological data are included which were obtained during previous surveys. This is the U. S. Naval Oceanographic Office's first survey utilizing SCUBA equipped divers and submersibles and represents a further expansion cf our data collection and survey capabilities to provide a more lucid presentation of ocean environmental characteristics Tie survey was performed to provide information applicable to thc installation of submarine cables in support of the U,, S. Navy's Atlantic Undersea Test and Evaluation Ceater.

Undersea observations from various submersibles reveal penetration by ambient light to depths as great as 700 meters. The range of horizontal viewing under ambient light in offshore tropic and subtropic areas varies from 5 to 6 meters (estimated) at 300-meter depth to more than 60 meters at 183-meter depth. Such observations indicate that ambient light may be usable for undersea tasks to greater depths than was anticipated.