A man who gets intentionally bitten by sharks insists he isn't "fearless".
Marine biologist Jeremiah Sullivan - who will feature in National Geographic's 'Man vs. Shark' special - has "been bitten thousands of times" since the early 1970s as he spends his time chronicling human-shark interactions in the name of science.
But he told the Daily Beast: "I'm not fearless at all. Fear is a funny thing.
"Fear of the unknown is really all it comes down to, so if you're well-informed about the environments you're going into, and prepared as can be, it puts you in a pretty good position. "Being a water guy and in the ocean virtually my whole life, it's not something that's frightening or fearful to me. It's more like home."