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darth frosty

Dark Lord of the Sith
BGOL Investor
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Coyote

Rising Star
BGOL Investor

I remember these (I used to scuba dive). It was a type of dive knife called a WASP Injection knife. They were marketed to scuba divers as a (last ditch) defense against shark attacks. They have a CO2 cartridge in the handle which leads to a hole at the tip of the knife. The idea was that the diver would stab the shark and then push the button, which releases a large burst of CO2 into the wound. The sudden expansion in the wound cavity can damage tissue and organs, and the gas introduced into the shark can disrupt it's neutral buoyancy. They never really caught on though, probably because there are many other tools to protect against shark attacks, all of which do not require you to get into a hand-to-hand fight with a shark.
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