Craig Clasen went head to head with the aggressive predator, shooting it seven times with a spear gun, when it was about to attack another fisherman. Mr Clasen was hunting yellow finned tuna with his friends Cameron Kirkconnell, photographer D J Struntz and film maker Ryan McInnis in the Gulf of Mexico when the close encounter happened.
The group were about to leave the deep waters south of the Mississippi River's mouth, when Mr McInnis found himself alone in the company of the tiger shark. Mr Clasen, 32, grabbed his spear gun and swam to help his friend, who was being circled by the giant predator.
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