Human: Please generate a brief description of a serene scene outside a sea cave with knotted rockweed, organ-pipe sponges, and a rocky wall. Assistant: 
Light green water above, deep green water below, green water all around. Pale patches of organ-pipe sponges grow among the knotted rockweed attached to the rocky wall that curves from the southwest to the north. Overhead, the shimmering surface of the bay rolls sinuously.