The World About Us S1971E25 - Kingdom of Coral

In the warm waters of the Coral Sea a long and bitter battle is waged - the endless struggle for survival.
A new arrival, Man, has recently appeared to affect the age-old balance of Nature. Equipped with aqua-lung and explosive harpoon, and an endless thirst for knowledge, he snares the poisonous sea-snake to discover the secret of its venom; he dynamites the shark that could kill him.
Ben Cropp, the outstanding Australian underwater photographer and director, captures beauty in the frond of coral, action in the excitement of a shark hunt: and he deals with a subject of ever-increasing importance - Man's place in, and destruction of, his environment.