Fishermen talk of a giant beast that hunts the tropical abyss of the Seychelles archipelago. Wily, strong, and tough as nails, the dogtooth tuna is said to be as ferocious as any shark. Naturalist and extreme angler Andy Coetzee is on a quest to find out if the legends about this sea creature are true. But to find out, he'll need to push himself to the limit, free dive deep into a seemingly bottomless abyss, and brave a storm at the start of monsoon season.