Dive knives are important accessories for scuba divers and those enter the ocean for other purposes such as maintenance cleaning and spearfishing. The knives help divers to set themselves free when they entangle with weeds and ropes under water, by accident.
Those divers, who forget to carry their knife, regret their mistake later as they are lifesavers in emergency situations. They also help in a number of unexpected underwater tasks such as to free an animal from a net or rope.
Dive knives should be made of rust-free corrosion resistant material to ensure long life; titanium and stainless steel are the materials of choice for dive knives. They should have a sharp blade to cut ropes and fishes and should feature a secure sheath that holds the blade in its position.
Some of these blades have additional features such as bottle openers and holes in the blade for one hand operation. The gear is easily secured in the calf muscles or thighs with the help of straps or gets tucked into the BCD for instant use as well.
There are different types of scuba knives available in the market such as fixed blade knives, folding knives, blunt tip, and sharp tip knives, regular and serrated bladed etc.
Let us discuss some of the best Dive Knives here and some tips to consider while choosing to buy Dive Knife.
Top 6 Best Dive Knives – 
- Promate Scuba Dive Snorkel Titanium Knife
- Cressi Skorpion
- Scubapro Mako Titanium Dive Knife
- Cressi Lima Tactical Dive Knife
- Atomic Aquatics Ti6 Titanium Dive Knife
- Spyderco Atlantic Salt Rust Free Serrated Edge Knife
Best Dive Knives
Best Dive Knives Reviews
- Titanium blade
- Length: 24 cm
- Blade length: 4.45 inches
- Rubber molded handle
- Adjustable straps
- Titanium bottom handle
- Rubber straps for leg attachment
The Promate Titanium Blade Dive is a full-size knife with a blade length of 4.45 inches. The overall length of the knife is about 24 cm. The material of the blade is corrosion resistant titanium. The blade features complete tang blade on one of its side and a serrated edge on the opposite side.
The knife is lightweight and its ergonomic handle has a rubber grip with finger ridges for holding comfort and durability. The handle of the knife has durable uses; it is used for hammering and as tank banger for underwater signaling.
The blade can have either a blunt edge or a drop point pin design. The blunt end allows it to function as a screwdriver as well. The knife has a secure lock with double push-button release and has an acrylonitrile styrene plastic sheath at its surface.
The blade is armed with a serrated end for cutting, a straight edge and a line cutter too. The knife demands very little or no maintenance and is the best for scuba divers and snorkelers. The pack includes two rubber straps for attaching to the leg.
#2. Cressi Skorpion
- Dimensions: 1 x 1 x 4 inches
- Weight: 8 ounces
- Knife length: 23 cm
- Blade length: 11 cm
- Blade: Tempered 304 AISI steel.
- Easy one hand release
- Leg Straps
The Cressi Skorpion is a well-balanced diver’s knife made of a strong tempered blade. It is popular among scuba divers and free divers and is available in both blunt top and sharp drop tip.
The stainless steel blade, made of tempered AISI 304 steel, is straight edged at one side while the other side has continuous serration along the edges along with a notch. Two leg attachment straps are included and the special sheath locking mechanism of the knife allows one hand operation.
Two lengths of the blade is 11 cm and the length of the entire knife is 23 cm. The handle is separated from the blade with the help of polymer thumb tab. The blade is ideal for both spearfishing and scuba diving.
They are of immense use during emergency situations underwater such as fellow diver getting entangled in a rope, when there is a need to cut fishing line when there is a need to signal fellow mates etc.
- Dimensions: 12 x 14 x 1 inches
- Weight: 12 ounces
- Resistant to corrosion
- Made of hardened Titanium
- Cutting notch for small ropes
- Bottle opener
A Diver’s knife is an important tool that is used for a number of underwater tasks such as cutting fishing line, pointing out to marine life, to signal to fellow divers by knocking on the scuba tank etc. The Mako Titanium Knives are extremely durable and are highly resistant to corrosion.
Their conventional cutting edge is very precise and helps to slice through a number of materials pretty easily. The handle features a multifunctional blade with an excellent and heavily durable cutting edge. The blade is of hardened titanium material, which renders the knife its characteristic durability and lightweight.
The knife features a special cutting notch that helps in cutting small ropes, nets and fish lines. The blade features two types of edges; it is continuous at one end and serrated at the other to help in sawing heavy ropes and even branches of trees. A knife features a bottle opener (a small notch on the sides of the blade) as a part of its convenience features.
- Weight: 1.6 ounces
- Length of the blade: 2.95 inches
- Compact and lightweight knife
- One hand release
- Dual-edge blade
The Cressi Lima Tactical knife for diving is one of the best accessories of choice for scuba divers and those participating in underwater sports activities. The best feature of this knife is its Line-cutting notch, which helps in cutting fish lines and small ropes.
Its serrated edge helps in sawing ropes of heavier width. This is a compact, lightweight yet highly efficient knife and weighs just 1.6 ounces. It is possible to attach the knife to the BCD or a gauge hose instantly for easy accessibility.
The sheath of the knife has a locking mechanism that aids in one-hand release underwater and also prevents accidental loss of the knife during water adventures. The length of the blade is 2.95 inches which have a standard cutting edge at one side and a serrated one at the other. At the serrated edge, there is a small ridge for cutting ropes.
- Corrosion resistant Titanium blade
- Curved 4 inch blade
- Large line cutting notch
- Quick release option
- Available with the pointed and blunt tip
- Adjustable leg straps
Atomic Aquatics is one of the most preferred brands by most scuba divers for underwater essentials. The Titanium Ti6 blade is extremely lightweight and versatile and is of high-grade Titanium make.
The knife has two edges, namely the plain edge and the serrated edge for carrying out different underwater activities. The blade is sharp to cut any ropes and lines and to set free from tangling ropes and weeds under water.
Since the blade is of hardened Titanium material, the knife is durable and resistant to corrosion and does not require much maintenance. The knife is full tang and stays stiff even after years of use without getting wobbly and loose.
The blades are available with a blunt tip and a pointed tip; many divers prefer the blunted tip as the sharp one is highly active. The ergonomic handle renders excellent grip over the knife and can go without rusting for months. Leg straps are available with the product to secure it with the leg or arm during the dive.
- Dimensions: 5 x 2.5 x 1 inches
- Weight: 0.16 ounces
- Made in Japan
- High-performance durable knife
- Fiberglass reinforced nylon handle
- Black titanium pocket clip
The Spyderco Atlantic Serrated Knife is a make of high-quality Japanese steel with nitrogen in its steel matrix. The knife has been manufactured without any heat treatment and gets harder and tougher with use. It is 100% rust resistant and features a sheep foot handle design to yield its versatility.
It performs extremely awesome underwater and allows efficient and safe cutting of almost anything. The knife features a hole in its blade of 14 mm diameter to enable one-handed operation in wet and gloved hands.
The high texture handle of the knife offers a non-slip grip and of fiberglass material reinforced with nylon. The back lock mechanism with lever dent offer reliable and secure blade lock up.
The titanium pocket clip supports both left and right side carry of the knife. There is a hole in this clip attachment which helps to attach a lanyard when the knife is in use around the coast.
Tips in Choosing the Right Type of Dive Knives
There are many different types and varieties of Dive knives but they can be generally put under two broad headings. One classification is on the material of the blades and another on their sharpness. Let us compare and contrast each of those types here and the type of knife that the diver wishes to use is entirely in his perusal.
Stainless steel or Titanium dive knives
The blades of almost all of the dive knives are of either Stainless steel or Titanium. The reason why 99% of the dive knives are of these two materials is that they are corrosion resistant.
This is an essential property of scuba gear, as it is going to stay in salty water for many hours.
Stainless steel of a softer material than titanium and thus sharpening the edge of the blade is quick and easy. But steel blades require frequent sharpening and are not as expensive as titanium knives.
Titanium knives are lighter and stronger, sharpening them takes time and effort, but they stay strong and sharp for a long duration. They are lightweight and require less maintenance.
Blades with Blunt tip or Sharp Tip?
All the models of dive knives available in the market fall under these two categories. For divers wanting to have a versatile tool in the form of a knife, then the blunt tip is the knife of choice.
Since they have a tip that is in the form of a square, they behave as an excellent cutting and prying tool.
They are the knives of choice of those drivers who are in maintenance diving to do underwater welding or boat cleaning works.
For divers concentrating on adventure scuba activities such as spearfishing, sharp tip knives are the choice.
Sharp tip knives offer a quick kill on all types of fishes. It is of much use when the diver encounters tangling weeds and ropes under water, in such instances the sharp tip knives are life savers.
They are also the best self-defense tools for those divers working in dangerous under waters filled with aggressive marine species.
Tips in Choosing the Best Dive Knives:
Two important considerations while buying dive knives are the material of its blades and the type of blade tips. Other important factors to consider before investing in a dive knife are,
Size of The Knife:
The size of the knife depends on how the diver wishes to use it. Size has nothing to do with performance though.
A small dive knife of four inches blade length is fine for recreational divers; the main purpose of the knife here is to get free of any tangling under water.
For those who get into the waters for spearfishing, for cutting fouled lines and kelp diving, a larger knife size is the choice.
Blade Knives are either fixed or of the folding type. The knives featuring a fixed blade have a sheath to store and secure it in its place. It is possible to use such type of blades in one hand. their security is at the push button system so as to avoid accidental propulsion.
Foldable blades are lighter and smaller. Most of the blades lock in their open position to prevent chopping of fingers while using. These models require two hands for their operation.
Edge of The Blade:
The edges of the blade can either be straight or serrated. Most of the dive knives have both the edges, one on either side of the blade. The straight edge is ideal for cutting plastic or nylon ropes, while the serrated edge is best to cut wood and other natural fibers.
Attachments For The Knife:
One hot topic among divers at recent days is where to fix these dive gears. Traditionally the lower segment of the leg, at the calf muscles ( legs opposite to the dominant hand) are the sites for securing knives.
But the greatest disadvantage of securing them in the leg is that they can get messy with seaweeds under water and other things while diving. The more convenient method is to carry the knife on the BCDs, as it is easier to reach and use.
the handle of knives features different materials and designs. It depends on the diver to choose the type of handle that responds to his actions and intentions better. Though the handle design has nothing to do with knife functions, they should yield to the convenience of the user.
They are predominantly genuine rubber makes or makes of artificial rubber components, paracord or even plastic
Ease of use:
Knives should be easy to use, should release from the sheath instantly as even a little delay in emergency situations can be life-threatening. They should offer a firm grip and release smoothly. Folding type knives should open up easily and the locks should open up instantly so that it doesn’t harm the fingers.
Resistance To Corrosion:
Knives come handy in diving and stay in the salty water throughout the diving session. It is important that these knives are of corrosion resistant material such as stainless steel or Titanium, as they have anti-corrosive properties. Titanium ranks first in corrosion resistance followed by H1 stainless steel and them by 420C stainless steel.
Durability is a crucial factor with diving gears. Full tang blades are extremely durable and are worth the cost. A durable sheath secures the blade from not falling into the water when it is most important in emergency situations.
Full tang blades are also corrosion resistant and require sharpening less frequently; they also retain their sharpness for long durations.
Scuba Diving is an art and a sport, a number of gears help divers in their safe diving experience and dive knives tops that list. It helps them with specialized diving and even spearfishing, it covers them in underwater emergency situations as well.
We hope our list of best dive knives helps you in choosing the best gear for your underwater expenditures. All of them lightweight with exceptional features and comes handy for divers without breaking their bank.
Whether to choose titanium or stainless steel knife or a one with a sharp or blunt edge or a knife with regular or serrated edges is all under the perusal of our readers.
As long as they are able to handle it safely and with the sense, we hope they would have a wonderful diving experience and the knife comes handy in all their underwater situations.
For more of our top gear recommendations, check out these popular outdoor gear guide links : Best Scuba Diving Fins | Best Snorkel Gear | Best Full Face Snorkel Masks | Best Dive Knives | Best Dive Lights | Best Spearguns | Best Snorkeling Fins