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Not to hijack the thread and take it off topic, but this seems to be a good opportunity to discuss large diving knives. Large diving knives, such as the 12.5 inch-long Wenoka I have, were often called "diver's tools" because they were designed to serve multiple purposes. The knife I have has a point, but the same knife came with a blunt tip option for prying. When underwater hunting was more popular than it is today, the blade was a perfect place to engrave a ruler. My blade is 7.5 inches with hash marks and numbers measuring 6 inches and hash marks showing every 1/2 inch. This was helpful for such things as hunting abalone and making sure that you were taking legal game. The blade is for cutting while a saw is on top of the shank. The front top of my blade is forged to act as a screw driver. It has a hammer on the butt end. The wide flanged grip is designed to protect your hand from slipping when wearing gloves. Most old wet suit gloves did not have any grip material on the palms and fingers so that feature helped.
Other than the obvious tools built into a knife's design what you do with such a tool is as ingenious as the user.
There seems to be a sort of mockery toward these tools among divers today. While both technical and recreational divers prefer small, strategically-worn cutting tools, most of these tools do not have the well-rounded capability of yesterday's knives. Small knives reduce entanglement possibilities and are less bulky when traveling, but I cannot tell you how many times I've been doing work underwater and I wished I had my frog sticker.
I replaced the commercial buckled straps with surgical tubing and kept my snorkel on the back of my calf with my knife inside to reduce entanglements when diving from boats that required snorkels be worn.
While the knife looks like a weapon in reality it is a pretty smart set of tools.
Most divers today don't hunt, don't do working dives, and frankly don't need a knife with a measuring device, hammer or pry bar ... hammering or prying "souvenirs" isn't as socially acceptable as it was years ago when there were very few divers around and nobody really much cared how much they damaged or destroyed things ... if a dive site got too hammered up there were plenty more where that one came from. Today we try to instill a better sense of environmental stewardship in a diver's mentality.
There's a reason why a lot of diving destinations have established "no knife" policies ... and most of them involve cases of people misusing equipment simply because they had it and didn't know any better. Almost nobody who dives today, outside of those who are hunting or taking prizes off of wrecks, needs a Bowie knife strapped to their leg.
Pretty much the only reason for any recreational diver to carry a knife is to deal with potential entanglement ... and you don't need a 7.5 inch blade with a hammer on the pommel to accommodate that need.
As the saying goes ... use the right tool for the job.
... Bob (Grateful Diver)