Jonas watches in horror as the megalodon is trapped in the steel cables connecting DJ's sub to the ship. As the megalodon is pulled to the surface, having its organs and flesh ripped apart by the cables, Jonas watches a second megalodon, a much larger female attracted by the struggles of her dying mate, rise out of the Trench. She attacks the male and feeds on him as he is pulled to the surface, his heated blood protecting her from the cold water layer that has previously kept them from entering the ocean. Jonas and Tanaka are worried about the imbalance in the ocean's ecosystem that might result from the re-introduction of a megalodon after an absence of millions of years as Jonas and Tanaka try to track down the megalodon. The female surfaces off the coast of Maui and kills several surfers. She also attacks a helicopter that Jonas uses to try and track her at night after discovering that thousands of years of living in the depths of the Trench has led the sharks to develop bioluminescent white hides and destroys a military submarine led by Taylor's commanding officer from his time in the Navy. Jonas and Tanaka realize that the female megalodon is pregnant and are determined to capture her before she gives birth. Maggie seizes this opportunity to advance her career and decides to film the shark from within a shark cage as she swims to California to give birth. During her sojourn north, the shark gives birth to three pups, one of which she devours and the second of which is killed by orcas. At the Farallon Islands, Maggie uses a dead whale to attract the shark, succeeding in filming it, but inadvertently causes it to attack her cage. Despite his best efforts, Jonas cannot stop the shark and rescue Maggie, leading to the creature devouring her as she tries to escape. Jonas and Tanaka track down the female after she attacks a whale-watching boat shortly after. After tranquilizing the shark and capturing her, Taylor's vengeful superiors and Maggie's lover try to kill the shark with a homemade depth charge, causing the shark to awaken and rampage, killing dozens of witnesses and bystanders, including Taylor's superiors themselves. While the megalodon is rampaging, Jonas pilots a submersible down her throat and into her stomach, where he uses the hydrogen supply from his sub to ignite the