In the summer of 1944, at the height of World War Two, a treacherous stretch of water in the Philippines claimed the lives of more than 150 American sailors, lost when the U.S.S. Flier and the U.S.S. Robalo sank. Neither sub has been found, and the exact cause of their sinking is unclear. Can the Dive Detectives unlock the mysteries?

Their search leads the Dive Detectives into dangerous waters—the territory of sharks and ruthless pirates. But the Team is protected by armed Coast Guard officers and assisted by dramatic clues. The deathbed revelations of a retired member of the U.S. Navy help launch the search for the Robalo. The Team is intrigued by leads that include a mysterious sketch appearing to pinpoint that sub's location.

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