Water Sports

5 Best Diving knives Reviews-Buyer Guide 2021

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?

THE BEST DIVE KNIVESDiving knives can be a life saver and serves as a vital tool for divers when underwater. This tool may be small but it can handle any obstacle that comes its way.

A diving knife can disentangle you and set you free from ropes, heavy underwater bushes and anything that can ensnare you.

Being trapped underwater could be a potential traumatic experience, but with a diving knife strapped to your side, you can work your way out of a mess.

In this review you will find a few of the top choices for diving knives, available on the market today.

Best Diving Knives

1.Tusa FK-940ti X-Pert II Knife Red

Tusa FK 940ti Red Knife
  • 6-4Ti (Ti-6AI-4V) Titanium drop point blade
  • Ergonomic grip with counterweight

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.

2. Promate Barracuda Dive Titanium Knife

Promate Barracuda Dive Knife
  • Titanium blade with Easy grip rubber molded handle with sheath and adjustable straps
  • Requires little or no maintenance

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.

3. Atomic Aquatics Titanium Scuba Diving Knife

Atomic Aquatics Scuba Knife
  • Corrosion-resistant full-tang Titanium blade
  • Elegantly curved 4-inch cutting edge

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.


Atomic Aquatics Scuba Knife
  • Atomic Aquatics Titanium Scuba Diving Knife
  • Corrosion-resistant full-tang Titanium blade

The Atomic Aquatics Titanium Ti6 diving knife is very versatile for many reasons.

First and foremost, the blade of this knife is made of an anti-rust material that can weather salt water and any other type of environment.

The 4 inch blade delivers an incredible sharpness and it is gracefully designed with a serrated side.

With a handle that is full-tang, the diver gets the required support needed for cutting oneself loose from a trap.

The handle has finger grooves for safe usage and a Titanium end cap, for an easy disassemble and knife clean-up.

Provided are quick-adjust sheath straps to keep the knife securely strapped to the side of diver, in order to be easily accessed. A push button, releases the knife immediately when needed.

Available for purchase with either a pointed or blunt tip. Users recommend the blunt tip in order to avoid a high risk of accidently hurting yourself with the knife. However, both tips work well to get the job done.

Unfortunately this knife is very expensive and does not come with a lifetime warranty. Despite its price it is still an attractive purchase for the avid diver.


Promate Snorkel Knife
  • Titanium blade * Titanium hammer on handle bottom * Quick release and adjustable straps * Easy...
  • Made for the professional diver in mind

The Promate Scuba Dive Snorkel Titanium Knife is an affordable item. The handle has an integrated, full tang that provides full support to the user. There is also a small titanium hammer designed to handle small objects.

This knife is available in many different colors. The color of the handle benefits the user as these handles are vital to finding your knife, if lost underwater.

At 4 3/8 inches long, the blade is known for its excellent sharpness retention. The blade tip is blunt and safe to use, while still offering high quality performance.

This knife is not very high maintenance. However, it is suggested to clean and dry this knife after every use and then store it in a safe place. The knife can be disassembled from the handle for simple cleaning.

The straps are easily accessible and the included sheath will keep the divers knife close and secure, to protect them from injury while diving. The straps have a safe locking system that keeps this tool, safely attached onto the diver’s belt or thigh.


Cressi Long Blade Diving Knife
  • The Borg is a modern, large knife with a futuristic design and a strong, tempered blade made of 304...
  • One side of the stainless steel blade is straight-edged, the other one is serrated right along the blade;...

The Cressi Borg Diving Knife is made of Japanese steel. It is affordable and offers the same top quality features and performance as more expensive dive knives.

With a total knife length of 10 ½ inches and a blade of 5 ½ inches long, this knife is designed to perform well.

Many divers like the sturdy and durable knife edge, it does not require much maintenance and stays sharp even after a number of uses.

The blade can be sharpened easily, but be sure to avoid injury when sharpening.

Even though this knife is lightweight and easily portable, it can handle any type of snare and help set the diver free.

Thanks to this knife’s full tang, users are able to achieve a sturdy performance. One downside to this knife is that when cutting through a large amount of brush or other material, the handle may show a slight shift of about a millimeter or two.

To keep this from happening cut through your obstacle in small bunches.

It comes with a strong sheath to the protect knife and diver. Also included are, leg straps. These may be too long but they can be adjusted easily, by trimming them to your desired length.

How to Select Dive Knives for Specific Activities

Divers carry knives for a variety of reasons. Some like to dig on the ocean floor to look for buried objects; others like to pry abalone off rocks.

Some carry knives to keep themselves alive should they ever become entangled in ropes or fishing line underwater.

Each of these circumstances requires a specific type of knife to effectively do the job.

Sometimes they can be used for more than one thing, but it’s best to stick with utility specific knives.

Line Cutter

Line Cutter

This type of knife is fairly small, and many have a blunt tip. They are usually no more than six inches long including the handle. The blades often have a serrated section for sawing through old rope.

This is the knife that can save a life should the diver get caught up in something on the ocean floor.

Their small size allows them to be packed in BCD pockets or strapped onto the breathing hoses. It’s a very versatile knife that can do a variety of safety related tasks.

Abalone Knives

To pry an abalone off a rock is a rewarding experience for almost any scuba diver, and it requires a long knife with a thick wide blade. It takes some force to remove the animal from the rock, and most conventional dive knives would either break or bend before the shellfish actually released.

A knife for this job needs to be around twelve inches long including the handle. The blade must be sufficiently thick to prevent bending, chipping, or breaking. One quarter inch thick blades are usually sufficient.

Most consumer grade diving knives are not this robust which is why many abalone divers now use a tool specifically designed for the job. However, many older military type knives can hold up to the challenge.

Spearfishing Knife

After a diver has speared a fish, it often flips and flops around on the shaft making it difficult to get safely to the boat. This is even more dangerous if it’s a large fish. Unless the diver has speared the fish through the head or the spinal chord, it’s going to flop around till it’s taken out of the water.

A spear fishing knife is a long thin dagger shaped blade that’s inserted into the fish’s head to dispatch him quickly. After this is done, the fish will cease to fight which means he can no longer injure the diver. Basically any sharp knife with a dagger shape will work. Many spear gun manufacturers sell knives specifically for this purpose.

Blunt Tipped

In many scuba shops, they sell knives with a blunt tip, and these are for digging and prying. They are not so much for cutting, but they do have a sharp edge.

Many people like to dig up things like shellfish, and they need a blunt tipped tool that can move some dirt. They are usually eight to ten inches long and have a serrated area on the blade. They may also have a line cutter or other utility type tools located on the blade or handle.


Before choosing a knife, make sure all the parts are made of stainless steel or titanium which will not rust or corrode. Even after washing, salt can remain in cracks and crevices to cause premature decay on poorly made knives.

Whatever your specific application is, plenty of dive knives are available. It’s best to stick with top rated scuba diving knives and models others others have recommended. Some brands can be cheap and of poor quality.

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).


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.


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