The marine research vessel Xarifa sails to the Indian Ocean with a team of scientists whose object is to explore the underwater life of the coastal regions and the coral reefs.
This first film shows the underwater world of the Red Sea, and viewers learn of the way in which large fish depend on the smaller species in connection with their problems of personal hygiene.
Series directed by Hans Hass and produced by Tony Soper
(A BBC television film first shown on August 6, 1958)