Cozumel Hyperbaric Chamber Locations: A Diver's Essential Safety Guide (2026)

Cozumel has two recompression facilities, both in San Miguel, the island's only town. The Costamed Hyperbaric Center is a multiplace chamber attached to Costamed's hospital on the island, and Costamed states it is a DAN Preferred Provider. The second chamber operates at Cozumel International Hospital as part of the SSS Recompression Chamber Network, which publishes a Cozumel address on Calle 5 Sur along with a 24-hour emergency phone line alongside normal daytime clinic hours. Both are hospital-based rather than standalone units, and both sit within a short drive of the downtown piers where most dive boats tie up.

That last detail matters more than it sounds. Cozumel lies roughly 19 km off the Yucatán coast, and a dive destination without a working chamber means a boat or air transfer to the mainland before treatment can begin. Having two hospital-based facilities on the island itself is one of the quieter reasons Cozumel works as a high-volume diving destination.

This guide covers what is publicly verifiable about those facilities, what the standard emergency sequence looks like from the moment a diver reports symptoms on a boat, why emergency oxygen rather than the chamber is the first treatment, and how to reach help. It is orientation and planning information. It is not medical advice, and no article can tell any individual diver whether they have decompression sickness — only a physician who examines them can do that.

Which Hyperbaric Chambers Operate on Cozumel?

Facility	Location	Affiliation	What is publicly stated
Costamed Hyperbaric Center	Costamed hospital, San Miguel de Cozumel	DAN Preferred Provider (per Costamed)	Multiplace chamber inside a full hospital; Costamed describes it as reaching up to 6 ATA and taking multiple patients at once, supervised by a physician with hyperbaric and diving medicine training
Cozumel International Hospital chamber	Calle 5 Sur, Cozumel Centro	SSS Recompression Chamber Network	Hospital-based chamber; SSS publishes daytime clinic hours plus a separate 24-hour emergency phone number for Cozumel

Two things are worth saying plainly. First, both facilities are attached to hospitals, which is the meaningful distinction in dive medicine: a symptomatic diver can be examined, imaged and assessed by physicians before anyone decides whether recompression is the right treatment at all. Several dive-related problems mimic each other, and a chamber without a hospital around it cannot rule the alternatives out.

Second, facility details change. Chambers go offline for maintenance, numbers get reassigned, and a page written months ago can be wrong on the day you need it. Treat the table above as a starting point, not a guarantee, and confirm current status through your dive operator or through DAN, which can direct a caller to whichever facility is actually receiving patients that day.

Why Does an Island Chamber Matter for a Destination 19 km Offshore?

Time to recompression is one of the variables that matters in treating decompression illness, and geography sets a floor under it. On an island, the alternative to a local chamber is an evacuation across water — a boat transfer or an air ambulance to the mainland, with weather, daylight, port closures and aircraft availability all sitting in the path.

Cozumel closes its port in bad weather. During hurricane season and norte conditions, the crossing to Playa del Carmen can be genuinely disrupted for a day or more. A diver needing treatment during a port closure is in a very different position if the chamber is a ten-minute drive away rather than across the channel. This is the practical argument for the island's medical infrastructure, and it is worth understanding before you assume that "there is a chamber nearby" means the same thing everywhere.

What Happens If a Diver Surfaces With Symptoms?

The sequence below is the standard recreational diving protocol taught across training agencies. It is what a competent crew will do, and knowing it means you can recognise whether it is being followed.

1. Tell the crew immediately. Not at the end of the day, not after the second dive, not once you are back at the hotel. Symptoms that get reported late get treated late. Divers routinely talk themselves out of reporting a tingling arm or unusual fatigue because they do not want to disrupt the boat or admit to a problem. That instinct is the single most common obstacle in the whole chain.
2. Get out of the water and stay out. Do not go back down. In-water recompression is not a recreational procedure — it is dangerous without the specific gas supply, equipment and trained personnel that recreational dive boats do not carry, and attempting it can make a treatable problem much worse.
3. Emergency oxygen goes on at the surface. The crew should administer the highest concentration of oxygen available, as continuously as the supply allows. This is first aid, not a cure, and it starts on the boat rather than at the dock.
4. The crew calls it in. The boat contacts shore, the dive centre and emergency services. Many boats also monitor VHF radio. The receiving facility is alerted while the boat is still travelling, so the hospital is expecting the patient.
5. Transport to a hospital-based chamber. The diver goes to a facility where a physician assesses them. Whether recompression happens, and on what treatment schedule, is a clinical decision made there.
6. Keep diving records with the patient. Dive computer, depths, times, surface intervals, gas used and the timeline of symptom onset are all clinically useful. Hand the computer over rather than trying to remember numbers.

Two things do not belong anywhere in this sequence: waiting to see whether it resolves on its own, and self-diagnosis in either direction. Deciding you definitely have decompression sickness and deciding you definitely do not are both outside a diver's competence, and both cause harm.

Why Is Emergency Oxygen the First Treatment, Not the Chamber?

This is the part most divers get backwards. The chamber is the definitive treatment, but oxygen is the first one, and it is the treatment that happens in the window that a diver and crew actually control.

Breathing a high concentration of oxygen at the surface increases the pressure gradient that moves inert gas out of tissues, and it improves oxygen delivery to tissue that may be affected. DAN's published guidance on treating decompression sickness puts surface oxygen at the highest available concentration at the front of the first-aid response, continued during transport. It is the reason the question "does this boat carry oxygen, and is the crew trained to use it?" is a fair and normal thing to ask before booking, and one of the things worth checking when choosing a Cozumel dive shop.

An oxygen kit that is on the boat but empty, expired, or that nobody has been trained to assemble is not oxygen provision. Operators running proper safety programmes will answer this question without hesitation. A Rescue Diver course covers the same ground from the diver's side and is the most useful non-technical training most recreational divers can do.

How Do You Reach Help in a Cozumel Diving Emergency?

Route	Number or contact	Notes
Mexican emergency services	911	The national emergency number throughout Mexico, including Cozumel
DAN emergency hotline	+1-919-684-9111	DAN states this line is staffed 24/7/365 for diving emergencies and accepts collect calls
DAN non-emergency medical line	+1-919-684-2948, option 4	Business hours, for medical questions that are not emergencies
Your dive operator	Take it before you board	The boat crew and shore staff are the fastest route to the right facility
Your insurer's assistance line	On your membership card	Needed for pre-authorisation and direct billing

The DAN emergency hotline number above was checked against DAN's own contact page in August 2026. Numbers do change, so if you are building a card to carry in your dry bag, verify it at dan.org before you travel rather than trusting any third-party page, including this one.

For the local chambers, this guide deliberately does not print a facility phone number. Published local numbers for both Cozumel facilities appear in several places online and they do not all agree. In an emergency, 911 and the boat crew are faster and more reliable than a number copied from a website, and DAN's hotline exists precisely to route divers to the correct receiving facility. Save those, and let the professionals handle the local call.

What Does Recompression Treatment Actually Involve?

If a physician determines that recompression is indicated, the diver is placed inside a pressurised chamber and breathes oxygen through a mask or hood on a schedule the treating team selects. The most widely used first treatment schedule for decompression sickness internationally is US Navy Treatment Table 6, which runs for roughly five hours. Follow-up sessions over subsequent days are common, and the number depends entirely on how the patient responds.

In a multiplace chamber like the hospital-based units on Cozumel, an attendant is pressurised alongside the patient, which is one of the operational advantages of the larger chamber design. What this means practically for a traveller is that treatment is not a quick stop on the way to the airport. It is a hospital admission that can extend over several days, and it will end your diving for that trip.

How Does Dive Insurance Change What Happens at the Door?

Dive insurance does not change the medicine. It changes the administration, and on a foreign hospital admission the administration is not a small thing.

Mexican private hospitals generally operate on a payment-guarantee basis. With a recognised dive insurer, the insurer's assistance line can issue a guarantee of payment to the hospital and coordinate billing directly, which is why divers are told to call their insurer early rather than after treatment. Without that, private hospitals commonly require payment or a card deposit at admission. Costamed states it is a DAN Preferred Provider, which is the specific arrangement that makes direct coordination possible for DAN members.

What this guide will not do is quote a treatment price. Figures circulating online for Cozumel chamber treatment vary wildly, none of them are published by the facilities, and printing an unsourced number would be worse than printing nothing. What is fair to say is that hyperbaric treatment plus a multi-day hospital admission abroad is expensive enough that dedicated dive coverage is cheap by comparison, and that standard travel policies frequently exclude scuba diving or cap it in ways divers do not discover until they claim. The travel insurance guide for Cozumel diving covers what to check in a policy before you buy.

Carry proof of coverage in a form you can produce when you are not at your best: a photo of the membership card on your phone, plus the assistance number written somewhere that does not need a battery.

When Can You Fly After Hyperbaric Treatment?

There is no published universal interval, and anyone who gives you a single number for this is guessing. Flying after treatment for decompression illness is a clinical decision made by the treating physician based on the individual case, the symptoms, the response to treatment and the number of sessions. It is routinely longer than the standard flying-after-diving intervals, and it is not negotiable against a return flight.

For ordinary diving with no incident, DAN's published minimum preflight surface intervals from the Flying After Recreational Diving workshop consensus are 12 hours after a single no-decompression dive and 18 hours after multiple dives in a day or multiple days of diving, with substantially longer than 18 hours considered prudent after decompression dives. Those are minimums, not targets. The flying after diving guide for Cozumel works through how this interacts with real flight schedules, and the practical answer for most trips is to make the last dive day a full day before departure.

If you are diving on the final days of a cruise call, the same logic applies with less slack in it — see the Cozumel cruise port diving guide for how operators build return buffers.

What Should You Ask Your Dive Operator Before You Board?

These are reasonable questions, and a professional operation will not find them awkward.

• Does this boat carry emergency oxygen, and is the crew trained and current in using it?
• What is the plan if someone reports symptoms — who is called, and in what order?
• Which chamber does this operator use, and is it currently operating?
• Is there a first-aid kit and a means of communication from the boat?
• Does the operator require or recommend dive insurance, and do they check certification levels against the sites they run?

The answers tell you a lot about an operation beyond the safety question itself. Compare how operators present themselves across the Cozumel dive centers directory.

What Reduces Your Risk Before Any of This Matters

The chamber is the last line, not the plan. The things that keep divers out of it are unglamorous and well established: conservative profiles, slow ascents, honest safety stops, adequate surface intervals, hydration, and not stacking deep repetitive days at the end of a hard travel week.

Cozumel carries a specific pattern worth naming. It is drift diving over walls, it is easy, and it is often four dives a day for a week — and that effortlessness is exactly what makes it possible to run a much heavier nitrogen load than you would at home without noticing. Divers who use nitrox in Cozumel often do so to add conservatism on repetitive days rather than to extend bottom time. The Cozumel diving safety overview sets out the wider conditions picture.

Putting the Safety Picture Into Your Trip Plan

Knowing where the chambers are is a five-minute piece of preparation that most divers never do, and it costs nothing. The useful version of this preparation is short: carry dive insurance and know its assistance number, save the DAN hotline, confirm the boat carries oxygen, plan a dry day before your flight, and report symptoms early rather than politely.

When you are ready to work out the rest of the logistics — operators, sites, timing, budget and the money side of a Cozumel trip — start with Plan Your Cozumel Dive Trip for a structured walk through the decisions in order.