Whistling and clicking their way around the oceans, dolphins have the scientists baffled with this mysterious underwater 'language.' Jacques Cousteau and his divers go in search of the dolphins, hoping to reveal how they steer by sound and communicate not only with one another but with man as well.
Some of the most dramatic scenes that Cousteau has filmed take place off the African coast, as man and dolphins combine forces and go fishing together.

Produced by Metromedia Producers Corporation
(from Bristol)
(Radio Times People: page 4)
(Colour)