This piece was composed for single screen and 3D multi-channel acousmatic (8ch is also available). Symbolizing the activities of underwater-livings was the idea for this piece. A photo of fishes taken at an aquarium was used as the material for moving images, but it does not show fishes clearly, but shows only its color-tone. The main part of music has been created from the recording of whales' voices. The difference between the acoustic of underwater and that of in the air was deliberately applied to structure the climax. Composed in memory of my old colleague who was a specialist of marine acoustic and the SONAR- system.