I have seen many great whites (reruns) that have been dispatched in the following manner. Place your scuba cylinder in the sharks mouth. Fortuneatley, for unknown reasons, they will continue to swim around with the cylinder in their mouth for some time. You can then find a rifle and shoot at the cylinder. In this way, the cylinder will explode taking the shark with it (Jaws I). Underwater, however, this would admittedly be difficult to pull off. Therefore I suggest the following method. Find an underwater electrical cable and place it in the creatures mouth. If the shark is truly aggressive, it will eventually bite through the cable and electrocute itself (Jaws II). I can assure you that the visuals from this will be quite stunning. So you see, there are many ways to deal with unruly sharks. You just have to be inventive.