SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!
SPOILERS AHEAD
Shark Gangs Plot Summary and Synopsis
Scientists have discovered and investigate the reason behind the behavior of sharks swimming around in gangs even though they are viewed as solitary predators.
Source: Wikipedia (CC BY-SA 3.0).