Back at Mana One, the crew discovers that the creature is a megalodon and it has escaped from the depths of the trench by swimming through a hole in the thermocline which the submersible created when breaching it. The group decides to track and poison the megalodon, which they succeed in doing. However, a second, much larger megalodon emerges and kills The Wall, Heller, and Dr. Zhang as it devours the smaller megalodon.