The concept of the program is "love saves the Earth," the main theme of this film is environmental destruction. In 2002, a trans-Pacific submarine train, the Marine Express, leaves California for Japan. The doctor who developed this state-of-the-art train, however, plans to explode it because he is worried about the environmental destruction under the sea. The doctor's personality caricaturizes a weakness in nature conservation groups, and imbues this film with profundity.