In the world of undersea gizmo's that a diver can get a hold of-this one ranks as the worst idea we have seen in the last ten years since the "underwater soup straw".
Welcome to the "Wasp" a standard dive knife with a kick.
Pumping several thousand psi of compressed air into whatever you decide to stab that's swimming by, it's guaranteed to baloon-i-fy even the most curious, bass, seal, nurse shark, or Al Qaeda type you may encounter in today's vicious oceans.
Bad idea-interesting video. Frankly there's just not anything all that scary diving these days to warrant something this crazy in the hands of any diver at 60 feet.