Returning to Mana One, the crew discovers the giant shark is a
megalodon, or "Meg". While discussing how to address it, Suyin's daughter Meiying witnesses the shark arriving at the station. The crew realizes that the Meg followed them through a temporary break they caused in the thermocline and resolves to go out and track the Meg before killing it with poison. After the Meg destroys three nearby shark fin fishing ships, Taylor enters the water to shoot the Meg with a tracker, and then the team puts Suyin in a shark-proof tank so she can shoot the Meg with poison. However, the mission goes awry when the shark attacks the cage and cracks Suyin's mask, causing her to lose oxygen. She manages to poison the shark just as Taylor manages to get her out of the cage. The Meg returns and attacks Taylor and Suyin, but it gets snagged on the cage's line and dies from the poison.
In their moment of triumph, a second, much larger Meg emerges, devouring The Wall and the dead Meg, critically wounding Zhang, and destroying the crew's ship.