A blue shark attacks a diver (Chad Patti)
30-year-old Chad Fatty was out spearfishing on New Year's Day when he was attacked by a blue bull shark and began screaming for his friend, Josh Loucks, to jump in and save him.
The chilling video showing the moment the diver screamed in terror as the world's fastest shark attacked him has garnered millions of views online.
Chad and Joss went fishing about 110 miles off the coast of Florida, when Chad attached a GoPro to his head to record himself diving in the deep water off Pensacola.
He didn't imagine that the camera would catch the moment when a 3-meter-long shark tried to devour him.
Chad was just on his way back to the surface of the water after a dive when the huge shark attacked him.
The terrifying screams of the terrified fisherman can be heard in the video and his friend can be seen diving into the water to rescue him.
Chad claimed he was convinced the shark - which can reach speeds of 70km/h - took off his leg when it ate his diving fin before disappearing. Speaking to the Pensacola News Journal, he said: "I was sure I lost a leg.
The shark basically drove my knee into my chest, almost knocked the air out of me, knocked the gun out of my hand and partially flooded my mask.
At the first shout, in 'save him', I wasn't sure I was left with a leg, honestly.
It wasn't just a blow."
Watch the chilling footage:
He added: "I slowed down the video 5 times its normal speed and you can clearly see that the shark was left with the fin in its mouth. You can see it biting it. It was a brutal attack by the shark. I was its prey. There was no mistake in identification."
Miraculously Chad was not injured in the attack.
He explained that the shark bit the fin on its leg as part of a popular hunting tactic used by the species to immobilize its prey.
He explained: "He did what every blue whale does. He tried to take out the engine, cut the tail off the fish with the first blow, paralyze it - then go back and finish the job. Luckily the boat was there and my friend Josh jumped into the water to meet me."
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Despite the dangerous experience, Chad says he will continue to go on his fishing trips and this incident will not stop him from doing what he loves.
Although blue tip sharks are known to be aggressive, attacks on humans are rare.
According to the International Shark Attack File, the blue shark is ranked as one of the most dangerous sharks and from 1980 to 2010 there were 42 blue shark attacks, three of which were fatal