What you need is a knife, the size of the knife doesn't matter.
This is what you do.
When you see the shark swimming around and you see the hunger in his eyes, you take out your knife and wait... You notice him swimming toward you, just hold to your knife and prepare yourself... You see him getting closer, just keep holding onto the knife... When he is close enough for you to see the hollow hunger in his eyes and he just keeps swimming toward you, you take your knife and.... stab the guy next to you and swim away, just stab and swim.
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