A group of students aboard a U.S. educational vessel on a ocean trip to study aquatic life discover the presence of the ultra rare and extra vicious 2 headed shark of the title. After an intial encounter with the sea beast causes damage to their vessel the students and their teacher abandon the ship for refuge on a deserted atoll. However, said land mass is suffering from some serious seismic activity, the ground seems to be opening up before them. Forcing these marooned students to enter the dangerous ocean waters in order to make it back aboard the ship they abandoned in the first place. If that seems a little redundant it’s appropriate as this whole movie borrows stock footage from other Asylum films to pad the stretched out plot points.