While I too rarely spearfish and do not advocate killing sharks under virtually any circumstance, I can assure you that the Shark Dart will kill a shark or just about anything it is stuck into. It is an effective weapon. There was the dagger style and one with a short pole spear arrangement. They are as safe to handle as would be a bangstick which uses 22Mag, 357Mag, 44Mag and various shot shells depending upon the version.
There is a knife available now that is similar to the Shark Dart called the WASP. It too is a very effective killing weapon.
http://www.waspknife.com/
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As divers, we all know what the effects of compressed gas are underwater. Our training teaches us that our lungs would burst from over-inflation if we held our breath and rose to the surface. This principle is key to the effectiveness of the WASP Injection System.
This weapon injects a freezing cold ball of compressed gas, approximately the size of a basketball, at 800psi nearly instantly. The effects of this injection will drop many of the world's largest land predators. The effects of the compressed gas not only cause over-inflation during ascent when used underwater, but also freezes all tissues and organs surrounding the point of injection on land or at sea. When used underwater, the injected gas carries the predator to the surface BEFORE blood is released into the water. Thus giving the diver added protection by diverting other potential predators to the surface.
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Even at depth the amount of CO2 volume injected is enough to ruin a shark's day. It will immediately destroy it's equilibrium and buoyancy if not causing most of the innards to come out it's mouth, as the sharks begins to rise, if it was not dead already, it soon will be. In any case, if it was attacking you, it won't be anymore. The shock of the freezing gas injection will immediately make it's two neurons decide you were not a good idea.
If you don't think these things work, you are kidding yourself.
N