The WASP Knife is a tactical knife that injects a frozen ball of compressed gas approximately the size of a basketball at 850 PSI directly into it’s victim. The WASP Knife is primarily used for diving when a diver is attacked by a predator like a shark. Capable of bringing down most large land or water animals quickly. One of the coolest features of the knife is that it will not allow the predator to leak blood into the water till the predator has reached the surface of the water, thus keeping the diver protected from other predators who nearby who could smell the blood.
I think that the WASP Knife is a very interesting concept and sounds like it would be very dangerous if it was every applied to human combat.