The marine photographer who captured the footage said it could be the world's first recorded sighting of a black seadevil ...

Prince Albert of Monaco starts to probe the sea's dark midwaters, discovering new kinds of eels, fish, and squid ... and spreads laterally to form new ocean crust, a process he calls seafloor ...

Beneath the ocean's crushing blackness ... The viperfish (pictured above) is a fierce predator, with fangs so big that its mouth can't close over them. Instead, they slide up the front of the fish's ...