The Wartle, a cross breed between a Leatherback Turtle, Blue Whale, and Jellyfish, was originally created as a cruise ship between underwater cities. The people would ride in the inner hollow of the jellyfish's core comfortably as the length of the Wartle is a whopping 600 ft. long. The only problem was the poisonous tentacles which the jellyfish kept stinging people with and was considered to dangerous and therefore banned.