Few sharks are known to inhabit the abyssal regions - such as sites down to 4,000 meters (2.5 miles) or more. What moves within oceanic trenches more than 6,000 meters (3.7 miles) down is a true mystery. Aside from the scarcity of food, temperatures there could be another limitation to deep-sea living. There are sharks that inhabit deep parts of the ocean. Among them are goblin sharks and Greenland sharks, which tend to have low metabolic rates. That means they move slowly, much more slowly than the energetic predators of the movie. Although C. Megalodon cruised seas across the globe, it tended to prefer warm, shallower waters. It even used coastal regions for nursing grounds.

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