Anti shark repelant
Someone should invent one.... something that if you fall in the water can be used as a weapon against the shark or some sonar that will repell the sharks.
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OK Guys, some funny comments on here. Some stupid ones too.
SharkPod & Shark Shield are 2 products that emit electrical pulses which interfere with sharks natural electroreception along their snout and sides, used to pickup small electrical charges created by muscle movement etc.
These products have been tested on Great Whites outside cages in open water and have proved effective. Once switched on the sharks stay far enough away to avoid the electical pulse.
As far as a weapon against a large great white power heads or shark sticks have been around since at least the 50's. They are sessentially a spear modified to discharge a bullet or shotgun cartridge upon impact. They have been used widely in shark hunting and self defence situations with sharks.
However, both these items may well have proved useless in this case as the characters did not enter the water voluntarily but rather capsized. They may not have been able to find these items in the upturned hull. Surely the characters would have taken more items if they had more time to search the capsized hull without fear of it sinking and taking them down with it.