Air injection kife, Sharks beware
The common misconception from non-divers is that a dive knife is used for “fighting off sharks”. The reality is more mundane since I think I’ve only ever used a div knife for freeing my regulator of stray fishing line. But this crazy knife would be the ultimate self deffense item for fending off jaws.
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.
Wow, I have to admit my inner Georgia Red Neck sort of digs this ;-).