Aqua Kids follows a group of children who, after the polar ice caps melt and the world collapses into a single island, discover that marine life has begun to evolve in unprecedented ways. Armed with a submarine and the aid of their robotic companions, the kids dive into the deep sea, where they uncover a hidden, ancient underwater civilization brimming with treasure. The revelation offers humanity a new hope for a future beneath the waves, yet a greedy real‑estate tycoon threatens to sabotage their quest for peace and prosperity.