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Shark Invasion

Mario Carneiro's surfboard, after being bitten twice by a 7.5-foot-long bull shark.

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The harbors surrounding Sydney, Australia, have become hunting grounds for some of the most dangerous shark species known to man. After three attacks in just three weeks, a wave of terror rises over the people of Sydney, whose waters are being haunted by great white, tiger and bull sharks. Using an elaborate underwater surveillance system, an elite team of marine biologists are able to track the predators, revealing how close the danger really is.