Diving 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.


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.


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.


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

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.