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In this gripping audiobook, marine biologist Alison Shaw faces pressure to replicate her team's groundbreaking achievement from the previous year. Meanwhile, a mysterious Russian submarine reemerges off the South American coast, drawing the attention of the US Navy, who deploy Officers John Clay and Steve Caesare to investigate its strange activities involving unmarked soldiers. As secrets unfold, the race is on for Alison and her team to uncover critical information before it lands in dangerous hands.