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Usually, a hard blow to the shark's gills, eyes or snout (end of its nose) will cause it to retreat. These are really the only vulnerable areas on a shark. If you have a spear gun or pole, use it! A sharp object is a good way to inflict enough pain to scare away the shark. Aim for the head, specifically the eyes or the gills. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/a9\/Survive-a-Shark-Attack-Step-4Bullet1.jpg\/v4-460px-Survive-a-Shark-Attack-Step-4Bullet1.jpg","bigUrl":"\/images\/thumb\/a\/a9\/Survive-a-Shark-Attack-Step-4Bullet1.jpg\/aid42848-v4-728px-Survive-a-Shark-Attack-Step-4Bullet1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class="mw-parser-output"><p>License: <a rel="nofollow" class="external text" href="https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/">Creative Commons<\/a><br>
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<\/p><\/div>"} If you do not have a weapon, improvise. Use any inanimate object, such as a camera or a rock to ward off the shark. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/cd\/Survive-a-Shark-Attack-Step-4Bullet2.jpg\/v4-460px-Survive-a-Shark-Attack-Step-4Bullet2.jpg","bigUrl":"\/images\/thumb\/c\/cd\/Survive-a-Shark-Attack-Step-4Bullet2.jpg\/aid42848-v4-728px-Survive-a-Shark-Attack-Step-4Bullet2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class="mw-parser-output"><p>License: <a rel="nofollow" class="external text" href="https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/">Creative Commons<\/a><br>
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<\/p><\/div>"} If you have nothing around you, use your own body. Aim for the shark's eyes, gills, or snout. Fight with your fists, elbows, knees, and feet. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/fa\/Survive-a-Shark-Attack-Step-4Bullet3.jpg\/v4-460px-Survive-a-Shark-Attack-Step-4Bullet3.jpg","bigUrl":"\/images\/thumb\/f\/fa\/Survive-a-Shark-Attack-Step-4Bullet3.jpg\/aid42848-v4-728px-Survive-a-Shark-Attack-Step-4Bullet3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class="mw-parser-output"><p>License: <a rel="nofollow" class="external text" href="https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/">Creative Commons<\/a><br>
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<\/p><\/div>"} Sharks have surprisingly rough and sharp skin, unlike the smooth scales of other fish, so be aware of this. Hit the eyes and gills repeatedly with hard, sharp jabs. Do not wind up before hitting, since this does not provide extra force underwater. You can also claw at the eyes and the gills. Keep doing this until the shark lets you go and swims away.

Summary:
Hit the shark in the face and gills.Your best bet, if attacked, is to make the shark see you as a strong, credible threat. Keep fighting if the shark persists.