Though all of us might have noticed this one in sci-fi movies and tales, it turns out that maelstroms actually do exist. In fact, the most powerful maelstrom in the world is the saltstraumen, which can measure a water speed of more than 20 knots and over 3,000 m3 of water flow.
If that’s not scary enough, they can literally suck in human beings, animals, and smaller objects.