Grendleweed grows at seashores and in lakes. It looks like common sea weed but it's the reason, why many people are afraid of "Kraut". Interwoven in their slithery leaves are very strong hands that can pull you underwater. and Keep you there.
How to fight it
Do not go into thick underwater growth. If they catch you, do not panic. You have to ease slowly out. They loosen their grip, when they think you're unconscious. A big, sharp knife also helps.gab