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Dirk Pitt, special projects director of NUMA, the National Underwater and Marine Agency, becomes engulfed in a series of bizarre events that will change his life forever when he sets out to investigate the cause of the fire that sank the cruise ship Emerald Dolphin in July, 2003.

The President's secret task force has developed an unprecedented defensive weapon that relies on an extremely rare radioactive element, and Dirk Pitt has followed a twisted trail to a secret cache of the substance.