diving knive, line-cutter or scissors for underwater application can be lifesaver. Diving knives are usually equipped with a sharp blade made of stainless steel or titanium. The blades should have the handle to the end of the knife a solid continuous reinforcement have a snap off to prevent. Diving knives are often heavily used and are also equipped with a line cutter to cut fishing line or underwater networks. But even strong fishing nets can be easily cut with a good dive knife.