A string of seven optical detectors deployed from a ship was used to detect the Cherenkov light from muons at ocean depths ranging from 2000 to 4000 m in intervals of -500 m. The flux and angular distributions of cosmic-ray muons were measured. An effective area for fivefold coincidences of 420 mZ for downward-going muons was achieved. The results are consistent with those derived from underground observations and theoretical calculations. The measured vertical intensity ranges from (9.8416.5 ) X lo-' cm-2 s-' srp' at 2090 m of water equivalent (mwe) to (4.57kl. 37)X l o p 9 cm-*s-' sr-' at 4157 mwe. String Bollom Conlroller FIG. 1. Mechanical configuration of the short prototype string. Optical module spacing is 5.18 m.

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