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To track down New Zealand's monster great whites, researchers build a submersible designed to look like a shark and pilot it deep into what they believe could be a mating ground - the Holy Grail of shark science.
In 2012, Michelle Jewell documented one of the largest great white mating scars ever recorded. Recently similar marks have appeared, leading her to believe this is a possible mating ground and that mega-shark El Diablo has returned to South Africa.
We have all seen the movies, sharks jumping into boats, circling in tornados, and risking their lives to attack humans. Could these shark feasts happen? Ian Ziering and Tara Reid pick up their chainsaws once again to see if a Real Sharknado could happen.