CLIVE CUSSLER is the author of coauthor of many previous books including Polar Shift, Dark Watch, Black Wind, Lost City , and Sacred Stone, and the nonfiction work The Sea Hunters II. The last describes the true-life adventures of the real NUMA, which, led by Cussler, searches for lost ships of historic significance. With his crew of volunteers, Cussler has discovered more than sixty ships, including the long-lost Confederate submarine Hunley. He lives in Arizona .
JACK Du BRUL is the author of the Philip Mercer series. He holds a degree in international relations from George Washington University . He lives in Vermont with his wife, Debbie.