We learn the tragic fate of Bell’s first Titanic expedition as Kate has a violent encounter with the Russian sub’s undead pilot. After the explosions that sank Topside, Caleb manages to escape in Junior - a small, one-person sub to rescue Kate. Together, Kate and Caleb begin to unpack the consequences of Simon’s actions and look to find a way to stop him from unleashing a deadly force on the world. But something is following them. 

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