Ghost from the Grand Banks — Arthur C. Clarke

In this near-future sci-fi novel by the author of 2001: A Space Odyssey, two companies competing to raise the Titanic find mystery among the wreckage.
 
Two years before the centennial anniversary of the Titanic's demise, two powerful corporations compete to recover the legendary vessel from the floor of the North Atlantic. With the wreckage split in two, each company -- one British and one Japanese -- plans to use its spectacular technology to raise one half of the famous ship. But what they find deep beneath the ocean's surface is more than they bargained for.
 
Discovered among the Titanic's remains are six perfectly preserved bodies, including one of a beautiful woman who was not listed among the ship's original passengers. Who was she -- and what was her secret? The mission to find out becomes all-consuming and, for some, deadly.
 
This fast-paced tale combines a centuries-old mystery with modern suspense and Clarke's visionary imagination -- here concerned with future technologies, ecological crises, and the mysteries of fractal mathematics.