Gooseneck barnacles are one of the most expensive seafoods. But getting your hands on them is difficult.

Gooseneck barnacles are one of the most expensive seafoods in the world. Just 1 pound can cost over $100 in Spain and Portugal, where the barnacles are considered a delicacy. But getting your hands on them is harder than it seems. The job comes with serious risks — and even the possibility of death. So why are these barnacles so difficult to harvest? And is that what makes them so expensive?