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Deep below the deceptively beautiful waters of the Atlantic Ocean, guarded by hundreds of dolphins, lie the astonishing remains of a mysterious lost city much like the legendary Atlantis. While mapping the ancient underwater metropolis of Marinth, marine architect Hannah Bryson makes a shocking discovery: She may have finally uncovered the truth about the once-glorious city’s mysterious demise. Marinth’s sudden disappearance has confounded scientists for years, but now, with the revelation of a key artifact, Hannah realizes that the long-buried city’s explosive secret could have dire consequences for the modern-day world. But she isn’t the only one who realizes it. The artifact is hijacked, and Hannah stands alone between a power-hungry enemy and widespread destruction.