A sonar and communication system based on the model of dolphins is currently being developed by EvoLogics, a spin-off of the Technical University of Berlin. For this purpose, the Berlin bionics researchers have studied the songs of the dolphins, with which they perceive their environment, detect food and communicate over long distances. The animals use complex sound signals of different frequencies into the ultrasound range. These are reflected on the objects under water, then received by the dolphins and then evaluated in the brain. Thus dolphins constantly receive a current acoustic picture of their environment. This natural data transmission under water is based on an optimized ratio of energy, frequency and duration of the sounds. With the technical reproduction of this biological transmitting and receiving unit, it should be possible to transmit images and sounds in high quality with low energy consumption over long distances under water.