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"You know why divers carry a knife? It's for when they finally have that hostile encounter with a great white shark. Now then, what can you do with a knife against a creature like that? You can't stab him, he's ten times your size and has a mouthful of teeth each as long as that knife. You can't out-swim it, he's fast faster and much more agile that you are. Then again, you won't have to be faster or a better fighter than a great white. All you need is to be faster than your dive-buddy with your knife in his back".