Dean810:Ok, let's settle this. The primary purpose of dive knives is to protect yourself from giant attacking squid, like in "20,000 Leagues Under the Sea". Therefore, they should be as long and sharp as possible. I don't know why anyone lake diving would wear a knife, since there are no giant squid there that I know of. Although maybe in Loch Ness.....
No no no, you've got it all wrong. To fight a giant squid you clearly need a harpoon and an electrified submarine. Or at least a dive-bat or shovel.
A