A night out goes terribly wrong when a shark attacks in a city canal. But this victim isn't alone in her urban tale. City waters are primed with hungry sharks ready to encounter residents.

A surfer's ambushed from below by a great white shark. He manages to escape - but his bitten board shows just how close of a call it was. Cases like this prove that sharks have mastered the art of the sneak attack.

A vicious attack occurs during a shark feeding in South Africa. With plenty of bait in the water, researchers wonder if sharks are beginning to see humans as competition for food.

A spear fisherman is mauled by a shark during a dive in the Bahamas. Researchers wonder if animals in the wild can offer clues of how to outsmart these perfect predators.

A diver is attacked during a routine move of a sand tiger shark in an aquarium. He survives, but is badly injured...leaving scientists baffled. Then, researchers discover the shark was pregnant.

Shark attacks are rare, but men are the overwhelming victims when they happen. Throughout history over 85% of all recorded shark attacks involve men.

On the North Carolina coastline, a spear fisherman dives a shipwreck and encounters a gang of aggressive sharks. Investigators are on a mission to find out why sharks are drawn to these human-made structures.

A shark robs a spear fisher of his catch and almost his arm. The usual suspects are Great Whites, Tigers, or Bull Sharks. But footage reveals a surprising assailant.