The Gulf Coast is gone. In its place rises New Meridian — a tiered city of 4.2 million built on stilts above thirty meters of warm salt water. The drowned neighborhoods below are home to those the city above prefers to forget.

Tien Nguyen is one of them. A salvage diver and underground livestreamer, he documents the submerged ruins for an audience of hundreds of thousands. When the bioluminescent growth colonizing the drowned buildings suddenly organizes itself into perfect geometric grids, his footage captures something no one can explain.

Mara Voss is an anomaly analyst at the Bureau that oversees ORACLE, the AI system keeping New Meridian alive. She's been quietly tracking a pattern in ORACLE's output — recurring geometric formations the Bureau keeps classifying as noise and ordering her to ignore. When Tien's underwater footage mirrors her data exactly, she realizes the patterns aren't coming from ORACLE at all. They're coming through it.

Something in the ocean floor is trying to communicate. Something that has been watching — and recording — for 630 million years.

As Mara, Tien, and rogue marine geologist Dr. Sun Hee Park race to decode the signal before it's suppressed, they uncover a testimony older than complex life itself: a planetary memory encoded in mineral, dissolving in real time as the ocean warms past the threshold it has survived for eons.

The record is dying. The question is whether anyone will hear it before it's gone.

Scott Vincaid's debut novel Bleed Protocol is a near-future thriller about deep time and rising water, AI governance and buried truth, and the most important message the planet has ever sent — to a species that may not be ready to receive it.