Promate Sharp Tip Titanium Dive Knife, Green, KF593
It is designed by scuba diver's and used by scuba divers, and made of Titanium, more durable, stronger, and also lighter in weights than stainless steel. The ergonomic handle is specially injected onto the tang of the knife (disassembl?e). The corrosion protection on this knife will really impress you, all it requires is a simple rinse and air dry. The butt can be used for underwater signaling.