
Megalodon
HighThe largest shark that ever lived went extinct 3.6 million years ago, unless the deep ocean is hiding something.
The ocean covers 70% of the planet. Most of it is unexplored. These creatures patrol the deep water, surfacing in sailor accounts and sonar readings across centuries.
16 creatures

The largest shark that ever lived went extinct 3.6 million years ago, unless the deep ocean is hiding something.

A skinless horse-rider hybrid rises from the ocean around Orkney, and its breath alone can wilt crops and sicken entire islands.

Hundreds of witnesses watched a giant serpent patrol Gloucester Harbor for weeks in 1817.

A humped sea serpent has been spotted off the coast of Cornwall since the 1900s, sometimes close enough to shore that beachgoers scatter.

A colossal red octopus lurking in Funka Bay, revered by the Ainu as both healer and destroyer.

Hunted to extinction just 27 years after Western science discovered it, some believe pockets of this gentle giant survive in remote Arctic waters.

Georgia's river serpent, a long-necked mystery lurking in the murky Altamaha.

Deep in the Amazon, locals say a snake longer than a river is wide guards the waterways.

South African legend says the gods made a creature so powerful they had to split it into elephants and snakes.

A massive white carcass with an elephant-like trunk that washed ashore in South Africa.

An enormous gray creature that churned the White River and earned state legal protection.

Massive, fleshy, unidentifiable masses that wash ashore worldwide, defying easy explanation until the lab results come in.

Nine bodies pulled from a South African river in 1997 were all missing their faces and brains.

When devastating storms hit KwaZulu-Natal, the Zulu say a giant winged serpent is rising from the falls.

A segmented, armored sea creature with dozens of lateral fins, washed ashore in Vietnam in 1883.

A marine humanoid reported by fishermen in New Ireland, with a woman's upper body and a fish-like lower half.