I remember my first real snorkeling trip like it was yesterday. I was in my early twenties, floating over a coral garden in crystal-clear water, watching parrotfish nibble at the reef. I wore a rented wetsuit that was a size too small because it was all they had left. I figured a little squeeze was fine-I was there to see fish, not to model gear. But by the end of the day, I was exhausted, short of breath, and wondering why something so simple felt so hard.

Years later, after hearing about the Snorkel Safety Study and reading through the findings from Hawai‘i’s Department of Health, I started connecting dots I hadn't even known existed. The piece of gear I’d always taken for granted-my thermal protection-might have been silently working against me. And I realized most of us never think about it that way.

The Wetsuit I Loved, and What It Was Really Doing

Wetsuits are great. I still wear one most of the time. They’re affordable, flexible, and do a beautiful job of keeping you warm by trapping a thin layer of water against your skin. For warm-water snorkeling, a light shorty is all you need, and it feels like a second skin.

But here’s what I didn't understand back then: every time I take a breath through a snorkel, my lungs have to create negative pressure to pull air in. The water itself adds pressure-just 12 inches below the surface adds about 30 centimeters of water pressure to each inhalation. And the snorkel adds its own resistance, which varies wildly depending on design. The study tested 50 different snorkels and found that resistance can differ dramatically, even among simple-looking models. The cumulative negative pressure from a few minutes of steady breathing can reach hundreds of centimeters of water pressure.

Now imagine my too-tight wetsuit compressing my rib cage on top of all that. My chest had to work even harder. That day I felt exhausted wasn’t just from swimming-it was from fighting my own gear for every breath.

What I Learned About Drysuits

I used to think drysuits were for serious divers in freezing water. Bulky. Complicated. Overkill for a sunny snorkeling day. But modern drysuits have changed a lot. They keep you completely dry with seals at the neck and wrists, and you wear insulation underneath that you can customize to the conditions.

The thing that surprised me most? A drysuit doesn’t compress your chest. At all. Your rib cage can expand fully with every breath. For surface snorkeling, where you’re floating face-down and breathing through a tube, that freedom makes a real difference. It’s one less source of resistance-one less thing for your body to work around.

I’m not saying everyone should switch. Drysuits are more expensive, require more maintenance, and add complexity with buoyancy management. But for certain situations-cooler water, long sessions, or if you have any concerns about your breathing or heart health-they’re worth considering.

The Quiet Danger Nobody Talks About

The study introduced me to something called Snorkel-Induced Rapid Onset Pulmonary Edema, or SI-ROPE. Fancy name, simple idea: when your lungs have to work too hard to inhale, negative pressure can pull fluid from your blood vessels into your air sacs. Fluid in the lungs means less oxygen getting into your blood. You get short of breath, weak, confused. And because there’s no splashing or struggling, an observer might not realize anything’s wrong until it’s too late.

The typical sequence goes like this: sudden shortness of breath, fatigue, loss of strength, then a feeling of panic and doom, followed by diminishing consciousness. It’s silent. And it’s real.

The research found that 90% of people who wore full-face masks in trouble considered the mask a factor. But it’s not just the mask-it’s the combination of everything that makes breathing harder. Immersion. Exertion. Snorkel resistance. And yes, chest compression from your wetsuit.

What I Do Differently Now

I still wear a wetsuit most of the time, but I’m a lot pickier about fit. I try it on before I buy, take several deep breaths, and make sure I feel zero restriction in my rib cage. If it even hints at tightness, I size up or look for a different model.

I also pay attention to how I feel in the water. If I notice my breathing getting labored or my energy dropping, I take it seriously. I signal my buddy, remove my mask, roll onto my back, and head in. No pushing through.

And I’ve started considering a drysuit for certain conditions-especially when the water’s cool and I’ll be out for hours. The freedom of movement and the lack of chest compression feels surprisingly good. It’s not for everyone, but it’s an option I’m glad exists.

Tips I’ve Picked Up Along the Way

• Check your fit. Whether wetsuit or drysuit, take a few full, slow breaths while standing in it. If you feel any resistance, it’s too tight.
• Know your limits. If you have a heart or lung condition, talk to your doctor before snorkeling. The study found that 44% of snorkel-related deaths showed signs of cardiac issues.
• Watch the cumulative load. Exertion, cold water, recent long flights, and equipment resistance all add up. Lower what you can control.
• Listen to your body. Shortness of breath, unusual fatigue, or a sense of panic are signals to get out immediately.
• Practice in shallow water. Get comfortable with your gear before venturing deeper. Know how it feels when you’re relaxed, when you’re swimming, and when you’re just floating.

One Last Thought

I love being in the water. It’s where I feel most alive-floating weightless, watching the world below, breathing slow and steady. That calm, easy breathing is the whole point. So now I choose my gear with that feeling in mind. Not just for warmth, but for how it lets me breathe.

Stay safe out there. Know your gear, respect the water, and snorkel smart.