There’s no limit to how much value a sharp knife brings to the table in a survival situation. That’s why you want to make sure it’s always sharp. Unfortunately, many may find themselves in a situation where they need a sharp knife to help them kill or clean an animal, but they’re stuck with a dull blade and no way to sharpen it. Fortunately, it’s possible to turn a smooth stone into a makeshift sharpener. It won’t necessarily give you a razor-sharp edge, but it’ll provide you with a good enough edge to work with.