TV-14 | Video | | Action, Adventure, Comedy
As a mutated, three-headed, great white shark eats its way from one end of the ship to the next, the passengers have to fight the deadly predator using anything they can find.
It is a sequel to 2-Headed Shark Attack (2012).
After the lab is destroyed, two survivors swim to the environmentalists' boat. After getting it started, one guy says that he cannot get the boat closer to shore because he is afraid of grounding it. But in the very next scene, we see the shark swimming below the boat in what looks like about 80 feet of water.