When the CIA used Howard Hughes as a cover to retrieve a Soviet submarine
A US intelligence operation involved a notable figure to retrieve a lost Soviet vessel. The goal was to obtain cryptological information from the submarine without arousing suspicion. A cover story was needed to explain the presence of a ship in the area where the submarine sank.
The solution came in the form of a plausible reason for the ship's presence. Further details about this operation are available, including the role of a well-known individual in helping to create a convincing cover story for the retrieval effort.