Blackout while spearfishing – I know my limits, I’m in tune with my body

The fallacy behind I don’t push myself and I’m in tune with my body. As the sport of freediving and spearfishing continue to grow unfortunately the fatalities from blackout will continue to grow as long as divers continue to ignore basic safety protocols.

Most divers know you are supposed to dive with a buddy and dive one up, one down. Yet many of those same people don’t do either of those things.

In my opinion, what follows is one of the reasons this decision is made.

Most people reading this article have probably tried seeing how long you can hold your breath. You took a big breath, hit the stopwatch button, and 30 seconds to two minutes later you were gasping for breath thinking you wouldn’t be doing that again anytime soon.

When you held your breath, in the beginning, it felt fine, even pleasant. At some point, you probably felt the urge to swallow, followed by a mild contraction. A contraction is where your diaphragm is physically and mechanically trying to draw air into your lungs. Twenty seconds later you experienced another contraction, still very mild, 15 seconds later another one, this one with a bit more urgency than the last one. This continued as each came faster and each time more insistent. At some point, you decided this is all the fun I can have today and you took a breath.

Everyone who has held their breath can relate to something similar to this: the spear-fisherman then thinks, “well, that’s how it would play out in the ocean. The same sort of things would happen.” But, they would be dead wrong.

Hypoxia presents itself very differently while ascending from a dive compared to holding your breath on the couch or in the pool. When you are in the pool or holding your breath on the couch, there will be a slow, steady increase in the frequency and severity of the contractions telling you to take a breath. When you are ascending in the ocean this does not happen. If you ascend from a dive in the ocean that results in a blackout, it’s likely you would have felt fine during that dive.

Now that seemingly every spear-fisherman has a GoPro on his or her mask, we see more and more videos of divers blacking out. If you’ve watched a lot of them like I have, one of the most common themes is the person who had the blackout is arguing with the rescuer saying they didn’t black out. They say, “I couldn’t have blacked out. I felt fine.”

The reasoning behind this is rather complicated and beyond the scope of this article but it’s due to rapidly dropping partial pressure of oxygen on the ascent.

Bottom line: if you performed a dive that resulted in a blackout, you would likely have felt fine.

The first video is an actual spearfisherman blacking out shot by Ren Chapman of Evolve Freediving. You can see clearly this person had no idea anything was wrong. The second video is a student of mine rescuing someone from a blackout.


The most common reason given for not diving in teams or having a buddy is the following: I don’t need a buddy because I’m in tune with my body, I don’t push myself, I know my limits, and I’ve never had a problem. Yet, if you had a dive that resulted in a blackout, in most cases you wouldn’t have noticed that anything is wrong. Now, do you see why saying, “I know my limits. I’m in tune with my body,” is pretty much worthless? How can you not push yourself if you would not even feel anything is wrong on a dive that results in a blackout?

Most people assume holding their breath while spearfishing would result in similar sensations as holding their breath on the couch. This false assumption, in my mind, is the primary reason divers believe “I don’t push myself” is a safety strategy.

Dying from a blackout would likely be one of the best ways to go. You would die doing what you love and likely wouldn’t be aware of anything. I’ve actually heard people use this as a justification for not having a buddy!

Dive one up, one down. Be close enough to grab your buddy when she or he surfaces and watch your buddy for no less than 30 seconds after surfacing.

I am not the Freediving Police. Dive however you want. My suggestion: dive safe out there. It’s not even that hard.

Spearing Magazine edit: Despite his words to the contrary, Ted actually is the official Freediving Police. Dive with an attentive buddy. Every single dive. Your family, your friends, your dive community, and we at Spearing Magazine need you to come home.


Problems equalizing your ears while freediving?


  • Struggling to equalize in the 15-35 foot range while freediving?
  • Notice its hard to equalize on the way down, but as soon as you turn around to head up yours equalize easily?
  • Tired of having people tell you just to pinch your nose and blow?


You are likely performing the Valsalva method of equalization.  If you continue to use the Valsalva method of equalization while freediving you will always struggle to get past 15-35 feet. Freedivers MUST be doing the Frenzel Method of equalization.

I have taught over 500 people how to Frenzel since 2011. I have an online course that teaches my step by step method. Watch the video below to learn more.




You can learn more about my equalizing course @










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