His Bones are Coral is a 1955 thriller novel by the British writer Victor Canning.

It was published in the United States with the alternative title of Twist of the Knife.

[1] The title is a reference to William Shakespeare's Full fathom five from The Tempest.

Escaping from the wreckage and needing to find a way out of his problems, he accept an offer from a marine biologist to take part in a coral-finding expedition in shark-infested waters.

directed by Samuel Fuller and starring Burt Reynolds, Arthur Kennedy and Silvia Pinal.