Welcome to Yietta, a breathtakingly beautiful planet where colonists live on a floating artificial continent. But there's trouble in paradise: A secret military organization is plotting to take control of the planet. A professor sabotages their plans -- at the cost of his own life. Now Captain Tita and her hyper-sub crew are putting &NFi;their&NFi_; lives on the line to rescue the professor's daughter. It's a planet-wide game of cat and mouse!