Robot Taekwon V 3: Underwater Commandos 1977

Directed by Kim Chung-gi

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.