Brilliant marine architect Hannah Bryson has been given the job of a lifetime. A U.S. maritime museum has just acquired the decommissioned Soviet submarine Silent Thunder for public exhibition. Itś Hannahś job to make sure that every single inch of the legendary nuclear attack sub is safe for the thousands of visitors anticipated. Enlisting the aid of her brother, Connor, they examine the enormous vessel and delve into its long---and lethal---history....