When a shift in warm ocean currents pushes a dense toxic red-tide plume toward Shimmer Reef's protected nursery lagoon, Koa — a young bottlenose dolphin with exceptional sonar precision — discovers that the pod's only escape route runs straight through a narrow, unmapped tunnel in the jagged Outer Atoll.
With pod matriarch Marina guiding strategy and tiger sharks closing in from the deep trench beyond the barrier, Koa must trust his sonar over his instincts and lead the most vulnerable members of his pod through waters no dolphin has navigated in living memory.
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