sub·lit·to·ral /-ˈlɪtərəl; ˌsʌbˌlɪtəˈræl, ˈrɑl/
  Sub·lit·to·ral a. Under the shore.
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  sublittoral
       adj : of or relating to the region of the continental shelf
             (between the seashore and the edge of the continental
             shelf) or the marine organisms situated there