5 Best Dive Knives (Reviews Updated 2022)

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When it comes to diving safety, the dive knife is an accessory you should definitely have in your swimming kit. When exploring the expanse of the seas, the dive knife will come in handy should you, a partner, or marine life get trapped in stray fishing nets or sea kelp, to quickly grant freedom with ‘cutting edge’ action, literarily. The ideal dive knife should be lightweight, durable, corrosion-resistant, and should easy to use.

Best Dive Knives

To help you save some shopping time, we have compiled a list of our top five dive knives from which we are sure you will find a product that clicks with you.

1. Snake Eye Tactical Dive Knife ll

Snake Eye Tactical Dive Knife Ll, All Stainless With Line Cutter, Razor Edge And Leg Strap Sheath

First, on our list, the Snake Eye Tactical Dive knife comes with a sleek all-stainless steel design and a razor-sharp cutting edge. It is lightweight and sports a 2-in-1 razor and line cutting edge for great flexibility. It also comes with leg strap sheath, is highly durable, and is the preferred choice for the diver who values a minimal design.

  • Sleek all-stainless steel design.
  • 2-in-1 razor and line cutting edge.
  • Highly durable and lightweight.
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2. Cressi Borg Diving and Spearfishing Knife

Cressi Borg, Long Blade Knife For Diving And Spearfishing Knife Pointed & Blunt Tip

The Cressi Borg sports a modern design and is made from high-strength 304 Japanese steel. It features a 2-in-1 razor and serrated cutting edge design, an ergonomic rubber-coated handle for the best grip, and a tank banger button at the base. It also comes with a one-hand release sheath for quick action, and two straps for a secure fit to your legs.

  • Highly ergonomic and durable.
  • 2-in-1 cutting action with tank banger.
  • Comfortable and quick to use.
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3. Spyderco Atlantic Salt Lightweight Folding Knife

Spyderco Atlantic Salt Lightweight Folding Knife Frn Handle With Spyderedge, Hollow Grind, H 1 Ste

This top-notch dive knife from Spyderco boasts of great materials for the best anti-corrosion performance and an excellent design. It comes with a comfortable, lightweight handle and a high-efficiency serrated blade design for the quickest cuts. It folds into its handle and also offers a titanium clip option for great portability, and can be attached to a lanyard so it doesn’t fall off.

  • Highly corrosion-resistant.
  • Durable and highly ergonomic.
  • Foldable design for great compactness.
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4. Promate Scuba Dive Snorkel Titanium Knife

Promate Scuba Dive Snorkel Titanium Knife (4 3 8 Blade) With Straps And Sheath

The Promate Scuba Dive Knife sports a simple, elegant design and the best material blends. Its 2-in-1 razor and serrated edge blade is made from Titanium, and is thus very lightweight and corrosion-resistant. It comes with a rubber handle for a comfortable, non-slip grip, a tank hammer on the bottom, and a one-handed sheath with adjustable straps.

  • Ergonomic design with one-handed operation.
  • Very lightweight, corrosion-resistant, and durable.
  • 2-in-1 cutting action with tank banger.
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5. Promate Scuba Diving Stainless Steel Knife

Promate Scuba Diving Snorkeling Sharp Tip Stainless Steel Knife (5 Blade)

Another great product from Promate, this 304 stainless steel dive knife looks like the real deal. It sports an ergonomic handle, is easy to maintain, and comes with a bottom steel hammer. It also includes a quick-release sheath for quick action, adjustable straps for a snug fit, and sports a razor and serrated cutting edge design for great cutting flexibility.

  • Easy to maintain and highly corrosion-resistant.
  • Ergonomic design and quick-release action.
  • 2-in-1 cutting action.
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Dive Knife Buying Guide

The dive knife is to the diver as an extra tire is to your car. While you may end up not using them, should an emergency occur, you always have a way out. A die knife gives you the perfect cutting edge to quickly free yourself, your partner, or an animal from entanglement.

Our buying guide reviews the best dive knives on the market based on their specified features and customer feedback to give you the best options to choose from. We also take it a step it a step further and outline key qualities you should look out for in a dive knife before you make a purchase.

Overall Size

Dive knives come in different sizes and choosing the right size is very important. The length of the blade should be long enough to allow the most surface contact per stroke, but should not be too long that it becomes too hard to handle. An excessively short blade will also require too many strokes to make a cut and could be costly in an emergency. Blade lengths between 3 to 4 inches are great for moderate-sized people. For bigger, stronger people 5 inches at most is a good buy. Anything longer, and you’ll be flaunting an assault weapon.


The material from which your dive knife is made plays a major role in its durability, weight, and strength. In general, stainless steel is a great material to look out for as it combines low weight with high strength, and will resist corrosion with proper maintenance. Titanium, on the other hand, while more expensive than steel, is much lighter, tougher, and is highly corrosion-resistant.

Cutting Action

The cutting action or blade design of your dive knife is another consideration to make. Straight, razor edges are great for cutting soft materials and thin ropes quickly. Serrated edges, allow for more surface area contact and are ideal to cut thicker ropes. The ideal knife should come with razor and serrated edges for great cutting flexibility.

Comfort and Ease of Use

The dive knife you go for must be as comfortable and easy to use as possible. Ideally, the handle should be coated with a soft material like rubber for a good, comfortable grip. Some dive knives, however, come in a naked design and are ideal for those who value compactness and low weight, but are not the best on the comfort scale.

The dive knife should also be quick to use. It should come with a sheath from which it can be easily removed with one hand. This allows you to take quick action when the need arises.