River Monsters

Something is terrorizing the Florida Keys, attacking both visitors and locals alike -- striking its victims so violently it is slicing open flesh, even smashing bones. Jeremy Wade is determined to identify the assailant, but is quickly out of his depth.

In the West Indies, tales of swimmers being ripped from the surface of the islands' blue holes have been attributed to a monster known as the Lusca -- half shark, half octopus. Extreme angler Jeremy Wade's investigation takes him to dangerous new depths.

Extreme angler Jeremy Wade's cases usually involve freshwater culprits, but with multiple reports of a deep-water serial killer in Mexico's Sea of Cortez, he must step out of his comfort zone and into uncharted depths in search of the red devil.

Extreme angler and underwater detective Jeremy Wade goes in search of the real creature behind the enduring legend of the sea serpent -- starting with a violent attack in the English Channel and culminating in the dark depths of the Mediterranean Sea.

In this special behind the scenes episode, Jeremy Wade reveals secrets behind his most dangerous season ever, revealing what it takes to take the show into the open ocean.