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Knife Supremacy

The Best Dive Knife For Your Underwater Trip

So you’re going diving, but don’t have a knife to take? Or you do have a knife to take but it is old, rusty, dull or worn out?

To be honest, you need a knife that will last under water, that won’t get rusty and will not go dull after a few uses. You know the saying, you buy what you get? Well that is true with diving knives, and that is why we compiled a list of dive knives that will be great for your next diving trip. A diver knife is a diver’s best friend. Well besides oxygen… ha.

A Few Things to Keep in Mind When Picking the Best Dive Knife

Size of the Dive Knife

You won’t need a huge knife in order to do the cutting you might need; in fact having a bigger knife could lead to bigger problems and you will have more potential to hurt yourself with a bigger knife than a smaller one.

On top of that, if you are a recreational diver you will only need a knife to cut nets, rope or wires in case you get tangled up in them, which means a smaller, serrated knife would serve you better.

I would choose a knife with about 3-4 inches of blade because…

  1. Won’t be as big and clunky
  2. Won’t take up as much room on your suit
  3. Easier to use and maneuver without hurting yourself

Shape and Type of Diving Knife

When picking out a knife for your dive trip it is important to factor in these 2 things…

  1. Is it a blunt or pointed knife?
  2. Is it serrated or plain edge?

1. Blunt vs. Pointed

We suggest, that if you are a recreational or new diver then you should get a blunt dive knife, the reason being is that blunt knives have a much lower chance of hurting you, especially poking yourself on accident. This can prevent you from a world of hurt, or puncturing your oxygen tank. (Now that would suck) It’s up to you though, we are just making suggestions to help you out.

On the other hand, if you are a seasoned diving veteran who knows how to use a knife properly then a pointed dive knife would be just fine. Although it’s suggested that blunt knives (especially in diving) are much safer than pointed knives.

2. Serrated vs. Plain Edge

Personally and from what I’ve read, serrated knives come much more in handy because serrated knives can tear through rope, lines, and netting much easier than plain edge. Think about it, each individual groove of the serrated knife will be able to tear ropes and netting apart, thus making a serrated knife much more beneficial than a plain edge.

However, the downside of a serrated blade is that they are much harder to sharpen and clean due to having individual rivets in the blade… with this in mind, if you are not looking to learn how to sharpen a serrated blade then I would grab a plain/straight edge knife to make life much easier for yourself when it comes to sharpening your knives. (You can check out a list of some awesome knife sharpeners here as well).

And if you do choose a serrated dive knife, then here is an excellent video on how to sharpen a serrated blade.

How to Sharpen Your Serrated Dive Knife


There you have it, he makes it look simple but it does require practice to get good at sharpening serrated blades, if you are willing to learn how to sharpen a serrated knife, then I would stick with it.

Material & Composition of the Scuba Diving Knife

Something else to keep in mind is the material that the dive knife is constructed from; typically dive knives are formed from either…

  • Stainless steel (typically 300-400 series)
  • Titanium

Stainless Steel

In general, stainless steel scuba knives come in 300-series to 400-series alloys. The higher you go, the better edge retention but will corrode and rust easier. The lower you go, won’t hold an edge as well but will be more rust resistant.

Stainless steel knives will corrode even if you have a 300-series, but this doesn’t mean that they are not good… stainless steel knives contain carbon, which means it will rust but the carbon adds extra strength to the blade.

This means that if you maintenance your knife regularly after each trip you will be just fine. Just make sure to wipe off the rust, sharpen it with a great knife sharpener, rinse with fresh water and use it again for your next trip.


This is the next step up from a stainless steel knife; virtually no maintenance needed to keep these bad boys sharp, however titanium knives tend to run at a higher price point.

Titanium knives tend to be harder to sharpen, but the fact that they hold an edge extremely well means that you won’t need to sharpen them regularly, I suggest sharpening them every 5-6 dive trips (less or more depending on amount of times you use the knife and how long it was in the water for).

List of  the Few Tips to Keep in Mind When Choosing a Dive Knife

  1. Blunt or pointed? (I prefer blunt tip)
  2. Serrated or plain edge? (I prefer serrated)
  3. Stainless steel or Titanium? (I prefer stainless steel)

These are all important things to keep in mind, because we don’t want you to get the wrong knife, granted these are all suggestions but they are suggestions made by experience, knowledge of the field and what others recommend in a general populous of the diving community.

Anyways, onto the list of the best dive knives we could find!

Our Choices on the Best Dive Knives the Market has to Offer

Promate Barracuda Dive Titanium Knife


The Promate Barracuda diving knife is made up of quality, and a design that makes it easy for the user of it to pull it out quickly and use it for any situation that comes at hand.

The Barracuda as well is sharp, which is perfect for slicing through cords, rope or anything that you are snagged on. On top of that it is made with quality in mind, which means it won’t rust, at least not for a while (titanium doesn’t rust very easily) so that is always a plus. I mean, how useful is a dive knife if it rusts easily?

And if you are a professional or amateur diver, then this knife is for you. It was made by Promate, and they design their knives for professional divers in mind.

Atomic Aquatics Titanium Scuba Diving Knife

Atomic Aquatics Titaniums Scuba Diving Knife

You can read our review of the AA Ti6 dive knife here.

If you are looking for a dive knife that is perfect for scuba diving, then man you have found the one. Tons of divers recommend this dive knife because it is one of the sharpest knives out there.

More importantly though, the blade is made with a full-tang titanium blade which means it is corrosion-resistant! (Yay!) So don’t fret about your dive ever rusting because this blade is made to last.

Oh and not to forget, it does have an excellent serrated side, which can slice through any junk that is in your way or wrapped around you. Oh and it is super sturdy, so don’t worry about losing your grip with this knife. 

However this knife is a pricey at about $130… but when you buy a more expensive knife, you are also getting a higher quality knife. I mean you can buy a $30 dive knife, but I can almost bet that it won’t last near as long as this knife.

U.S. Divers Titanium 5-Inch Diving Knife

U.S. Divers Titanium 5-inch Diving Knife

Need a knife that can cut through almost anything under water? Well you have definitely found the right one here. The U.S. Divers knife is an awesome knife because it comes with a line cutter, serrated edge and a sharp point. How great! Although this is one the pricier end, but as mentioned before, you get what you pay for. And quality is king.

It is a simple knife, but sometimes simple is better. You don’t need a gadget that stands out and draws attention from unwanted guests… especially under water.

Oh and not to mention… but it does completely disassemble allowing you to fully clean the knife. This a great quality in a knife, because you can clean every nook and cranny without leaving any water in the knife, thus causing ware and tear in the handle. OH! and it comes with a 2 year warranty.

Tusa FK-940ti X-Pert II Knife Red

Tusa FK-940ti X-Pert II Knife

If you love the color red, and you need a divers knife, then man you cannot miss out on this knife! However, the color of it may take some getting used to, because it is a bit bright, but that’s a minor flaw.

This knife may look eye-catching but it is not a weak knife. The Tusa is built with quality in mind; it has a highly corrosion resistant titanium drop point blade, which means you won’t have to worry about your blade rusting for a while. And if you need a knife sharpener you can always check those out here.

Oh and did I mention, it also has a line cutter and serrated edge, yippee for being able to cut through wires, ropes, cords and all that other junk! I have to mention as well that a lot people like the grip of this knife, and it is reported to have a very comfortable and firm grip on it. (That’s always a plus)

Overall this is a high quality knife, that can cut through just about anything.

Seavenger Titanium Knife Diver’s Knife

Seavenger Titanium Dive KnifeLast, but certainly not least is the Seavenger dive knife. This is a more affordable dive knife, which is great for you folks who are on a budget. However, don’t let the low price make you think it is low quality.

The reviews of this underwater knife reveals that it is very sharp and is a knife to not be trifled with. It has a titanium blade, which is corrosion resistant which can leave no doubt in your mind that this knife will last your a very long time. However, if you need a knife sharpener you can check them out here!

This knife is a little bit smaller than all of the other knives mentioned, but that doesn’t mean it is a bad knife. Just some people prefer a knife that is bigger, because you can make longer knife motions and have a bit more range. Just keep in mind though, it may not last as long as the other knives because it is a little bit more on the lower budget end.

 Wrap Up of Some Awesome Dive Knives

What it comes down to is finding the right match for you, and these 5 that we offered are some great knives that will make a great match for your next diving trip.

I really like the Promate Barracuda; it’s just a mean, green (or if you choose another color) slicing machine. I suggest checking out each of these knives to find the perfect one for you, and if you do choose one let me know the comment section below! I would love to know which one you chose!

1 comment… add one
  • Just wanted to say that I really like this guide.I think it’s comprehensive but at the same time really easy to understand and find the sharpener that best fits your needs. Great guide!I would like to congratulate you for this great video tips. I hope in next time we will get better video tutorial what will be very much helpful for us.Most knives don’t need to be sharpened, they just need the burr straightened with a few licks of a steel. Learn to use a steel properly and you won’t have to sharpen your knives all the time.

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