Underwater Kinetics Blue Tang Hydralloy Dive Knife

The Underwater Kinetics Blue Tang Hydralloy Dive Knife is a full-size dive and rescue knife built for divers who want corrosion resistance, strong cutting performance, and reliable underwater access. Made with UK’s proprietary Hydralloy blade material, the Blue Tang is designed to deliver a sharp, durable edge while resisting the harsh effects of saltwater dive environments.

Built as a serious dive safety tool, the Blue Tang includes a straight slicing edge, serrated edge, hooked line cutter, contoured grip, signaling pommel, and a secure quick-release sheath system. It is available with either a drop-point blade or blunt-tip blade, giving divers the option to choose the tip style that best fits their diving, rescue, or underwater utility needs.

Why It Works

• Hydralloy blade material combines strong edge performance with saltwater corrosion resistance.
• Straight edge, serrated edge, and hooked line cutter handle rope, line, and common underwater entanglement materials.
• Quick-release sheath uses dual side buttons to help prevent accidental release.
• Contoured grip fits comfortably in either hand for secure underwater handling.
• Signaling pommel can be used to tap on a tank for underwater communication.
• Interchangeable color ID accents help make the knife easier to identify in shared gear setups.

Perfect For

The Underwater Kinetics Blue Tang Hydralloy Dive Knife is ideal for scuba divers, rescue divers, spearfishing support, kelp diving, wreck diving, and anyone who wants a dependable full-size underwater cutting tool. It is especially useful for divers who want a corrosion-resistant blade with multiple cutting surfaces and a secure leg-mounted sheath system.

Features

• Full-size dive and rescue knife
• Hydralloy corrosion-resistant blade material
• Available in drop-point or blunt-tip blade styles
• Straight slicing edge
• Serrated cutting edge
• Hooked line cutter for monofilament, rope, and light netting
• Contoured grip for right- or left-hand use
• Soft rubber thumb guard
• Choil for controlled grip positioning
• Signaling pommel for tank-tapping communication
• Dual-button quick-release sheath
• Quick-release leg straps
• Interchangeable color ID accents
• Tool-free disassembly for cleaning
• Made in the USA
• Limited lifetime warranty

Technical Details

• Brand: Underwater Kinetics
• Model: Blue Tang Hydralloy Dive Knife
• Product Type: Full-size dive and rescue knife
• Blade Material: Hydralloy
• Blade Options: Drop point or blunt tip
• Blade Length: 5.00 in / 12.70 cm
• Overall Dimensions: 10.00 x 2.15 x 1.00 in / 25.40 x 5.46 x 2.54 cm
• Weight: 9.30 oz. / 263.65 g
• Sheath: Quick-release sheath with dual release buttons
• Mounting: Quick-release leg straps
• Primary Use: Scuba diving, rescue diving, underwater utility, and entanglement safety

Knife Specifications

Blade Style Guide

Mounting Tip: Adjust the leg straps with your exposure suit on, then test the fit before entering the water. Wetsuit material can compress at depth, so the knife should feel secure without cutting off circulation.

Care Notes

• Rinse the knife and sheath with fresh water after every dive.
• Remove salt, sand, and debris before storage.
• Inspect the sheath lock before each dive to confirm the knife snaps securely into place.
• Keep the blade sharp for emergency cutting performance.
• Use caution when disassembling or cleaning the knife, as the blade edges are sharp.
• Store dry and away from prolonged direct sunlight or excessive heat.

How It Compares

Compared to smaller compact dive knives, the Blue Tang Hydralloy offers a larger 5-inch blade, multiple cutting surfaces, and a traditional leg-mounted sheath system. Compared to titanium dive knives, Hydralloy is designed to provide a strong cutting edge and corrosion resistance at a lower cost than titanium.

Bottom Line: The Underwater Kinetics Blue Tang Hydralloy Dive Knife is a rugged full-size dive and rescue knife built for divers who want strong cutting performance, corrosion resistance, secure sheath retention, and reliable underwater utility in a proven UK design.