Stuntman Jose Marco was killed on-camera when a great white shark bit through a protective net and attacked him. Samuel Fuller had clashed with the producers on a wide variety of issues; when the production company used Marco's death to help promote the film, he quit. When Fuller saw the version that was released to theaters, he said it had been butchered so badly in editing that it was no longer recognizable as his film. He demanded that his name be taken off of it, but the producers refused.
The opening credits include the following printed statement: "This film is dedicated to the fearless stuntmen who repeatedly risked their lives against attacks in shark-infested waters during the filming of this picture..."