Mako, Jaws Of Death (Uncut Version) (1976)

aka: The Jaws Of Death

Filmed without the benefit of cages or mechanical sharks to offer protection! A man (Richard Jaeckel) who is studying sharks learns to communicate with them. When they are hunted and killed, he turns them against their captors. Plenty of graphic shark attack scenes. Also with Jennifer Bishop and Harold “Oddjob” Sakata. (Uncut! Highly recommended).