They appeared on Earth 49 million years before us. Brains are large and complex. They radar systems - more powerful than any known to man. They dolphins! And now they need your help. This is a unique mammal urge you and all your strength to outsmart one of the deadliest predators abyss. The longer the chase, the more he will be furious. Dolphin Sonar code. Lonely Seagull, her only hope. And you. You are listening? Each sound is a signal that it is time to act, to guide the dolphin in its treacherous track through seahorses and underwater currents, away from danger. There is much to learn and not to lose time. Dolphins are waiting, and the same - a giant squid!