Great question—and one that doesn't get asked nearly enough. After years of guiding snorkel trips and spending countless hours in the water around Hawai‘i, I've learned that a well-stocked first aid kit isn't just for scraped knees. When you're dealing with ocean conditions, sun exposure, and the unique physiological stresses of breathing through a snorkel, your kit needs to address more than the typical land-based cuts and bruises.

Let me walk you through what I carry and why, based on real-world experience and the latest safety research.

The Essentials: Wound Care & Skin Protection

• Antiseptic wipes and antibiotic ointment - Coral cuts are no joke. Even a tiny scratch from coral can become infected within hours thanks to the bacteria and organic material in warm seawater. Clean any cut immediately, apply antibiotic ointment, and cover it.
• Sterile gauze pads and medical tape - For larger cuts or abrasions. I prefer non-stick pads because standard gauze can adhere to wet wounds.
• Waterproof bandages in multiple sizes - Standard adhesive bandages will peel off the second you re-enter the water. Look for transparent, waterproof, extra-adhesive options.
• Moleskin or blister pads - Snorkeling fins can cause brutal blisters, especially if you're breaking in new gear. Apply moleskin before you feel hot spots developing.
• Coral rash treatment - A small tube of hydrocortisone cream (1%) can calm the stinging, itchy rash that sometimes appears after brushing against fire coral or certain hydroids.

The Respiratory & Breathing Section (Don't Skip This)

This is where snorkeling-specific first aid differs from a standard kit. Based on the Snorkel Safety Study and the documented phenomenon of Snorkel-Induced Rapid Onset Pulmonary Edema (SI-ROPE), we know that breathing distress can occur suddenly and silently.

What to Pack

• A written emergency action card - Laminated. Include these steps:
  • If you or your buddy experiences sudden shortness of breath, fatigue, or loss of strength while snorkeling, remove the mask immediately.
  • Roll onto your back, signal for help, and breathe slowly and deeply without any snorkel device.
  • Exit the water and rest in a seated position.
  • If symptoms persist, seek emergency medical care and inform responders that SI-ROPE may be involved.
• A small notepad and waterproof pen - If you're assisting someone who had a near-drowning or breathing episode, jot down the timeline of symptoms. First responders need to know: Did they aspirate water? Was there a struggle? Did symptoms come on suddenly or gradually? This information can be critical for proper treatment.
• A pulse oximeter - Yes, really. A small fingertip pulse oximeter can measure blood oxygen saturation. Normal is 95-100%. If you or a buddy is below 92% after a snorkeling incident, that's a medical emergency—even if they seem to be breathing okay. SI-ROPE can cause dangerously low oxygen levels without obvious signs of distress.

Environmental & Marine Life Concerns

• Vinegar or a commercial sting treatment - For box jellyfish stings (common in Hawai‘i and other tropical locations), vinegar deactivates nematocysts. Do not use freshwater—it can trigger more stinging cells to fire.
• Tweezers - For removing sea urchin spines. Soak the area in vinegar first to soften the spines, then gently extract with tweezers. Do not break them off below the skin.
• Stingray treatment information card - If stung, immerse the wound in hot water (as hot as the victim can tolerate without burning) for 30-90 minutes. This denatures the venom proteins. Then clean and bandage.

Heat, Hydration & Exertion

• Electrolyte packets - Snorkeling is more physically demanding than most people realize. You're swimming against currents, holding your breath, and breathing against resistance. Dehydration and electrolyte imbalance can worsen fatigue and increase risk. Add one packet to your water bottle.
• Sunscreen (reef-safe, SPF 50+) - Reapply every 80 minutes, even if you're wearing a rash guard. Sunburn impairs your body's ability to regulate temperature and can lead to heat exhaustion.
• A small cooling towel or instant cold pack - Heat stress compounds breathing difficulty. If someone feels overheated, apply a cold pack to their neck, armpits, and groin.

The "Buddy System" Communication Kit

• A waterproof whistle - Attach it to your mask strap or rash guard. Three short blasts is the universal distress signal. It carries much farther than your voice over wind and waves.
• A brightly colored signal flag or float - If you're snorkeling in open water where you can't touch bottom, a dive float with a flag makes you visible to boats and other water users. It also gives you something to hold onto if you need to rest.

What NOT to Include (And Why)

• Don't pack aspirin or blood thinners - If someone is experiencing a suspected stroke or heart attack, aspirin can be appropriate—but in a snorkeling context where SI-ROPE or pulmonary edema is possible, you don't want to thin blood unnecessarily. Leave medication decisions to medical professionals.
• Don't rely on "rescue breathing" masks - While CPR masks are useful for trained responders, the priority in a snorkeling emergency is removing the victim from the water, removing their mask, and getting them breathing room air. Rescue breathing in the water is extremely difficult and often ineffective.

A Final Word on Prevention

The best first aid is prevention. The Snorkel Safety Study found that 38% of near-drowning incidents involved full-face masks, and 90% of those users considered the mask a contributing factor. While I'm a fan of the Seaview 180 full-face mask—which was engineered with airflow separation and reduced CO₂ buildup in mind—no mask eliminates the inherent risks of snorkeling.

Before You Get in the Water

1. Check that your mask fits properly and seals well.
2. Test your breathing at the surface in shallow water first.
3. Know your limits. If you have any respiratory or cardiovascular condition, consult your doctor before snorkeling.
4. If you've recently flown long distance, wait 2-3 days before snorkeling. The hypobaric exposure during air travel may temporarily compromise lung capillary integrity.

Stay aware, snorkel smart, and pack that kit. The ocean will always be there—make sure you are too.