Woody Harrelson, Simu Liu, and Peaky Blinders breakout Finn Cole are saturation divers Duncan, Dave, and Chris, tasked with repairing trans-ocean oil pipelines on the sea floor. Along with several other three-man crews, they work off of the dive support vessel Tharos, which, on this mission, has to sail into a storm.

When George is handed a list of possible traitors, including Kathryn, he immediately sets out to discover whether her wife is lying to him. After an extensive game of cat-and-mouse, which at first appears to indicate Kathryn is playing both sides,