Description: the terrifying moment a swimmer is attacked by one of the ocean’s most lethal creatures—the box jellyfish. Against the deep blue of the sea, the translucent predator wraps its near-invisible tentacles around the man’s arm, leaving angry red welts that burn across his skin , - Box jellyfish are sea creatures with cube-shaped bodies, belonging to the class Cubozoa. They are invertebrates (animals without backbones) and some species have venomous tentacles that can deliver dangerous stings. A few species, like