The best way to teach someone to swim is to push them into the water. This is what some people think.... And the best way to test newcomers in business is to send them to an underwater city attacked by gremlins. So says the Professor, the famous hero of the Base, who suddenly discovered in himself pedagogical talents. With his filing, a young task force is sent to the case: an insurgent, two technomages, and an engineer. True, technomages are beginners, the fighter is too militant, and the engineer is a kitten at all, but, according to the experience of the elders, the presence of talking animals in the group only adds fun and adventure!