Longest Animal ever Discovered

While exploring a canyon that lies 2,000 feet below the surface of the Indian Ocean, a robot made an unusual find; a 150-foot-long siphonophore that scientists believe is the longest creature ever found. The specimen was discovered by scientists aboard a sea vessel coordinated by a marine research organization.
They were on an expedition to explore the submarine canyons that lie close to Ningaloo off the coast of Western Australia when they made the find. The creature itself is a predatory animal that stings and paralyzes small creatures like fish that it feeds on.