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It's over 500,000 square miles of rumored mysteries. In reality, the Bermuda Triangle may be filled with something even more incredible - Sharks. Marine Biologist Dr. Austin Gallagher is searching for the holy grail of shark research - the secret breeding grounds of tiger sharks, and he's hoping one special shark can lead him to it. (National Geographic)
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Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel
Photo © National Geographic Channel