Probably no legendary sea monster was as horrifying as the Kraken. According to stories this huge, many armed, creature could reach as high as the top of a sailing ship's main mast. A kraken would attack a ship by wrapping their arms around the hull and capsizing it. The crew would drown or be eaten by the monster. What's amazing about the kraken stories is that, of all the sea monster tales we have, we have the best evidence that this creature was based on something real.