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The best knife for freediving safety and foraging

A knife is totally optional in freediving unless you want to spearfish and forage. But it can still be nice to have for safety, such as if you need to cut through a fishing line.

I recommend wearing your knife on your inner calf so that it doesn't get tangled while swimming through kelp forests. This position also makes it easy to see when wearing a mask & wetsuit, so you can visually verify that you have returned it securely to its sheath.
  • Short and sharp
    Spearfishers need to be able to spike the brain of a fish, so a good spearfishing knife has a sharp point and is not too long, otherwise it slips off the fish's head.
  • Serrated edge
    The knife is also a safety and utility tool for freediving, particularly for cutting ropes and line, so it should have at least one serrated edge.
  • Easy to use sheath
    An important but often overlooked feature of a good knife is its sheath. Make sure it has a visible locking mechanism, such as a rubber loop over the handle. It is hard to hear the "click" of an invisible locking mechanism in the ocean through a wetsuit hood, so a visible locking mechanism is better.
Top pick: Fins and Foam knife
The Fins and Foam knife is the perfect freediving and foraging knife.

It is the right length (11cm) with a sharp point and serrated edge.

The sheath attaches to your calf, which makes it easy to access and see.

The rubber loop closure means you are never in doubt whether you have re-sheathed it correctly.

I have used only this style of knife for years and never lost one.
Another good option: the Kona knife
The Kona knife is a bit shorter than the Fins and Foam knife, but otherwise similar and very reliable.