A group of people at a marine life research center are being terrorized by a three-headed shark. The shark, attracted by pollution, goes on a rampage and the group tries to escape. In the chaos, some of the characters die, and the rest try to come up with a plan to stop the shark. They use contaminated water to confuse the shark, causing it to eat itself. Eventually, the shark dies, and the remaining characters are rescued by a helicopter.
Here are the facts extracted from the text:
1. The movie starts with a boy telling his friend that if he reaches the buoy, his friend will have to follow him.
2. A shark appears, attacking the friend and causing chaos.
3. The protagonists, including Maggie, Laura, Nelson, Max, Allison, Omar, and Ryan, are introduced.
4. The group arrives at an island where Matt and Will work at a marine life research center.
5. Dr. Laura explains that they are investigating marine life mutations due to pollution.
6. The group discovers that the shark is a three-headed monster.
7. The shark attacks the group, causing destruction and chaos.
8. The group tries to escape the island using an escape ship.
9. Max goes to bring the escape ship to the group, but it is further away than expected.
10. Ryan goes to help Max, and Allison betrays him, trying to save herself.
11. Omar chases after Allison, and the shark attacks them.
12. The group manages to escape the island, but not without casualties.
13. They arrive at a tourist dock, where they meet a boy who has proof that the shark attacked his friends.
14. Maggie comes up with a plan to take the shark to the laboratory and confuse it by making it eat itself.
15. The group uses a boat to distract the shark and throw away bags to distract it.
16. The shark eats the bags, and the group manages to escape.
17. The shark eventually eats itself and falls asleep eternally.
18. A rescue helicopter arrives to save the group.
19. The movie ends with the group being rescued.