#1 New York Times bestselling author Clive Cussler delivers another page-turning NUMA adventure featuring an underwater exploration team on the hunt to discover ancient hidden treasure&;before the world as they know it changes forever.When Kurt Austin, the leader of a courageous National Underwater and Marine Agency exploration team, rescues beautiful marine archaeologist Nina Kirov off the cost of Morocco, he becomes the next target of Texas industrialist Don Halcon. A madman bent on carving a new nation out of the southwestern United States and Mexico, Halcon&;s scheme hinges on Nina&;s recent discovery involving Christopher Columbus and a priceless pre-Columbian antiquity buried in the battered remains of the sunken Italian luxury line Andrea Doria. Only Kurt Austin and his NUMA team stand between Halcon and the Andrea Doria&;s silent steel hull&;and if their deadly mission fails, Halcon will ride to power on a wave of death and destruction.