Jonah, an apprentice oil field diver, is partnered with Seed, a parolee from Angola, Louisiana's notorious maximum security prison. The two strangers work in the brutal and exotic offshore world of the Gulf of Mexico. An accident enrages Seed, and his shocking retaliation starts a blood feud. Roughnecks and Riggers across the Gulf want retribution against Jonah's dive team. Every assignment sends Jonah farther out to deeper and more dangerous jobs. Topside, he must fight to survive the worst that men can do, while undersea he works in a surreal world where every breath can bring death, the night ocean lights up with bioluminescence, and giant predators hunt.