Infinite Ryvius(1999)

Infinite Ryvius is a sci-fi anime series that follows a group of teenage trainees forced to take control of a hidden spacecraft after sabotage destroys their space station. When the station begins its fatal descent toward the mysterious Sea of Geduld, the teens must abandon their instructors and escape aboard the Ryvius, an advanced interstellar vessel buried within the station's depths. Cut off from adult leadership and racing against time, these young astronauts must master the ship's systems and navigate the unknown dangers ahead. Survival depends on their training, quick thinking, and ability to work together as a crew. The series explores themes of responsibility, trust, and growing up under impossible pressure as the teenagers confront both external threats and internal conflicts during their desperate journey home.