(also known as Caine and Man-Eater) is a 1969 Mexican-American action film directed by Samuel Fuller and starring Burt Reynolds and Silvia Pinal.

Though she alleges the purpose of the dive is scientific research, Caine eventually realizes that the woman and her partner are actually treasure hunters, and sees an opportunity to utilize the riches from the wreck they hope to raid to compensate for the earlier loss of his cargo.

[1] In July 1966 it was announced Gaumont Pictures would make a film from the novel, directed by Byron Haskin, starring George Montgomery and produced by Mark Cooper.

In April 1967 it was announced Twist of the Knife would be produced by Skip Steloff for Calderon-Stell and directed by Sam Fuller, his first film since The Naked Kiss.

"[6] Even before filming began, the producers announced they had signed Fuller to a four-picture deal, including a sequel to Caine.

It has been claimed that while shooting in the waters of Isla Mujeres, one of the film's stuntmen, José Marco, was attacked and killed on camera by a shark that broke through protective netting.

This supposed attack was said to be captured on film and prompted a photo spread in Life magazine.

[1] However, in an investigation published in Skin Diver magazine, dive-shop operator Dewey Bergman claimed to have been unable to find any record of the supposed attack, receiving statements from local port authorities and medical officials which denied any knowledge of such an incident.

[8] Marine biologist Richard Ellis wrote that "[i]t was a perfectly harmless sequence in which no one was hurt except the shark, which subsequently died", and claimed the photographs published in Life were accomplished with "lots of ketchup".