Raise the Titanic! (Dirk Pitt Series #3)

The President's secret task force develops the ultimate defensive weapon. At its core: byzantium, a radioactive element so rare sufficient quantities have never been found. But a frozen American corpse on a desolate Soviet mountainside, a bizarre mining accident in Colorado, and a madman's dying message lead Dirk Pitt to a secret cache of byzantium. Now he begins his most thrilling, daunting mission--to raise from its watery grave the shipwreck of the century.