3-Headed Shark Attack

While studying the effects of ocean pollution and the Great Pacific garbage patch, the marine biologists, Ted Nelson and Laura Thomas, along with a small team of researchers, find themselves stranded on an isolated island. Now, after the sudden attack of a massive 3-headed great white shark on the underwater research facility, Persephone, the survivors must come up with a plan to outsmart the mutated aquatic predator before they become shark bait. But, the bi-headed killer of the 2-Headed Shark Attack (2012) was already too much to handle. What makes them believe that they'll escape the triple jaws of the ravenous three-headed monstrosity?