Ultramarine Diving Knife

mildot326

mildot326

Joined
Jan 2, 2007
Messages
374
Alright troops, time to get some info from the "experts". Does anyone have experience with this dive knife. Quality? worth the price?
Please "chime in".

Manufacturer: Extrema Ratio

ULTRAMARINE

The ULTRAMARINE is the result of four years of research and development, conducted by Extrema Ratio in collaboration with Military Dive Teams of the Italian Special Forces, Law Enforcement Dive Teams and Civilian Underwater Operation Experts.

Units involved in underwater and amphibian operations use a variety of specialty tools.
The main objective of the ULTRAMARINE Project is to substitute these different tools with one versatile utensil capable of performing the multitude of tasks that professionals in the fields are asked to perform in these difficult and challenging operations.

Diveknife.jpg
 
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I am pretty familiar with Extrema Ratio, and from what I hear all their products are built like a tank and are as expensive as one as well. I'd go with the Benchmade 100SH20BLK, as the price is right and Benchmade quality is far above-par as well. However, I have not heard a positive or negative word about the knife you are referring to. My .02 worth, for what it's worth.
 
I am spearfisher myself (diving) and I can't see myself using that knife for the intended purpose. Having two edges makes it dangerous under water and the cutouts in the blade make it weak. No matter how well thought they are, they weaken the blade. And a diving knife is going to be used for a whole lot more of things than just cutting. And last but not least, knives used in the water tend to get... lost. I wouldn't buy it for diving.

Mikel
 
Ditto against a double edge for diving. Very unsafe. Also ditto on the notch. A line cutting notch is a plus as that's what you usually need to cut when diving, but it neends to be at the base of the blade, in the choil area. At about 6" the blade is awful long for diving. The positioning of the line cutter also raises the question whether it will catch on things when you don't want it to. And finally, a dive knife should never, never, be used with a lanyard. Better to drop it (and then use your backup dive knife) than have it flopping around your wrist on a lanyard cutting the whatever out of you and everything else. No, if you want a real dive knife instead of an expensive wannabe, spend far less on a real dive knife by Underwater Kinetics, or one of the mainline dive equipment manufacturers like Oceanic or Scubapro. Mission makes a very nice and expensive titanium dive knife also.
 
I've used the Underwater kinetics for over 100 dives now, the titanuim is great, you don't have to rinse it off, I went with the spear point and figured it I broke it off I could chisel grind it myself. Back to the extrema, I just picked up my first one and love it, however I would have a hard time taking a 300 dollar "stainless" knife diving.
 
I would also like to point out that while we, spearfishers, need our knives to finish off prey and do need a point... maybe as a diver you could be better suited with a screwdriver tip. Superb for prying open stuff and if it fits in the slot, you can also used as a scredriver.

How do you guys like the titanium? Stainless diving knives are not the best in edge rettention, that's for sure but... is titanium well suited for cutting edges? I mean... does it rate high enough in the RC scale to be worh something? Mission has a nice line of extremely expensive knives... so I guess that even with some hype on them, they must be darn good tools. My question is just about the titanium models.

I will also like to point out the Delfin and Tiburón diving knives from the Aitor spanish brand... I have used both and they are fine tools, and not expensive at all.

Mikel
 
A 'novel' interpretation of how to design and build dive knives, let's make 'em potentially dangerous to the user, weaken the blade and incorporate a snag hazard.

It looks 'Tacti-Fool' - an essential item for a pool ninja!
 
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