Throughout history there have been sightings of a massive Octopus big enough to attack and sink boats. Could such a creature really exist? Our divers probe the depths of the North Pacific.

The most venomous creature of the sea is on the move and spreading across the oceans leaving a trail of baffled scientists and poisoned victims.       

For centuries the Amazon has been home to a frightening feeding frenzy of the most ferocious fresh-water monsters known to man... piranhas. These fish are said to "mutilate swimmers.

Andrew and Brian venture out to solve the mystery of the La Concepcion, a shipwreck near the Bahamas where over 300 men were eaten by sharks in 1563. To discover the truth of why the sharks attacked, the two men will attempt to recreate the circumstances.

Tony Harris travels to the Florida coast to investigate the legendary Bermuda beast and other mysterious sea creatures at the Bermuda Triangle.        

Sharks have terrified people for centuries, and deep within the forbidding waters of Mexico's Baja Peninsula may lurk a mammoth sixty-foot monster.    

Across the world, people are reporting increasingly frequent encounters with frighteningly large crocodiles. Millions of years ago prehistoric cousins to today's crocodiles stalked the earth, ate dinosaurs, and grew to enormous sizes.

Mariners have long told stories of frightening beasts that stalk the coast of Florida, but new video could prove that old sailors were seeing real sea monsters.