(CNN) - Just when you thought it was safe to go back in the water, terrifying images emerge from the deep.
No, it’s not Jaws, or any other shark. But a sting from a jellyfish this big might hurt more than a bite from a great white.
A diver was stunned when she spotted the human-sized blob off the southwestern coast of England, near Cornwall.
It’s called a barrel jellyfish.
They are the largest species of jellyfish in British seas, but seeing one this big is very rare.