Robot Taekwon V 3: Underwater Commandos Jul 20, 1977

Humanity builds ocean farms and ocean ranches all over the place, and Robot Taekwon V is tasked with protecting them. Meanwhile, the commander, Hoon, Cheol, and Dr. Norman's daughter Yuri begin to devise countermeasures inside the sea base to find the famous oceanographer Dr. Norman who has gone missing.