Oberlin awakes from a chemically induced fog to find himself tied up in an abandoned oil rig. A strange voice begins interrogating and torturing him. The person wants to know one thing: Where is Macallan Orsel?

Macallan and Tulley are badly injured by the sudden explosion on the Cedar Elm. They find themselves trapped in a dead sub that is upside down wedged beside a deep overhang in the ocean canyons. The positioning of the sub makes using the emergency lift bags impossible, and not enough power remains to attempt other rescue protocols. But despite their dire predicament, a far deadlier threat lies waiting for them in the surface.