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In the palm of your hand!

Dive knives are funny things. On one hand, they’re probably the one item that non-divers think of first when they think of dive gear.

The image of a diver in wetsuit with a knife strapped to his calf is for many the quintessential image of the sport. And true enough, a large, sturdy dive knife is among the first purchases many new divers make (along with a dive watch, perhaps going for that James Bond-look).

Yet many experienced divers dive with their knives not on their calves, but on their BCD’s or low-pressure inflator hoses, or with no knife. And those who do dive with knives, often prefer small, compact knives to the large, Rambo-style knives.


One such knife, and one preferred by many advanced technical and cave divers, is the classic Halcyon H Titanium knife.

The first thing you notice when unwrapping it, is that it doesn’t come with any leg straps. Nor does it come with a high-end plastic-polymer sheath with some advanced locking system.

Rather, it comes with a simple nylon sheath, embroidered with an “H” on the front. The sheath doesn’t lend itself to mounting on

Thomas Grønfeldt Senger

a BCD, nor really on a low-pressure inflator hose. Rather, it is designed to be worn on the waist belt of a technical wing-style BCD (Halcyon is one of the preferred brands of DIR divers).

And for this, it is ideal. A very flat design and a simply sheath means that there’s minimal bulk. The knife is held in place by a simple velcro strap.


The knife itself is about 15 cm long total, with a blade of some 6.5 cm. Divers often don’t need larger knives, but for spear hunters, a larger knife for finishing off a speared fish, and for cutting and cleaning it once back comes in handy. For that, you’d need a secondary knife.

The blade features both straight and serrated edge, as well as a line cutter at the base of the blade. The butt of the handle feature a blunt, protruded metal spike, intended as a hammering tool or as a tank banger. The handle itself is small, yet well-designed, and rest comfortably in the hand, even with thick winter gloves on.

The blade is high-grade titanium, a much harder metal than steel, meaning it will keep its edge better, and won’t rust. This is truly a knife you mount on your gear and just forget about, until you need it.

The good

Titanium is by far the superior metal for dive knives, making this knife lightweight and corrosion resistant.

The small size means it won’t get in your way, and mounting it on your BCD waist belt allows for easy access and minimal entanglement risk. Price is lower than many comparable titanium knives.

The bad

For those who prefer to mount their knife on the inflator hose, this knife isn’t ideal.

It can be done with a few plastic strips, but will never be ideal. Also, if you feel the need for a large blade, this one simply won’t cut it (no pun intended).

Also, the titanium more than doubles the price of this knife compared to dive knives of stainless steel.

Bottom line

For divers, especially those using wing-and-backplate BCD’s, this is a great knife, at a very reasonable cost.

For divers preferring to keep their knives in other places than on their waist belt this knife might do well with another sheath. But the functionality and value of the knife itself is hard to beat.