In 1976 Clive Cussler published Raise the Titanic!, a novel in which a team of undersea adventurers attempted to bring the famous shipwreck to the surface and recover its treasures.
But Cussler's hero Dirk Pitt was late to this game: For the previous six or seven years, the CIA had been secretly attempting something similar in the real world, with a much more dangerous treasure in mind.
Adapting a nonfiction book written by that project's director, Philip Carter's Neither Confirm Nor Deny chronicles the massive amount of work (and money) the CIA put into an effort to retrieve a Soviet submarine that sank in the Pacific Ocean in 1968.
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