"The Utsubo pocket submarine is feared and hated by all the sailors in the world. Its ability to be where he is not expected, to strike hard and run away fast is most frustrating for enemy officers. Equipped with both silent and economic engines, it is also completely crewless, and entirely remote-controlled. The Utsubo is hence a revolutionary war machine, that fully deserves its role in the mighty Imperial Navy ! Its only setback lies in his limited artificial intelligence : when on its own, it is mostly disoriented and useless, and needs support from another unit, or a Space Program, to acquire and engage enemy targets."