Exploring the Life-Saving Science of the Galway Hyperbaric Chamber

Last night, members of Athlone Sub Aqua Club and Galway Sub Aqua Club had a rare opportunity to visit one of Ireland’s most vital medical facilities: the National Hyperbaric Medicine Unit at University Hospital Galway. This experience offered a unique glimpse into how science and medicine combine to save lives beneath the surface—all without getting wet.

As a First Aid Instructor, I find the intersection of emergency medicine and technology fascinating. The hyperbaric chamber is a masterclass in this blend, providing critical treatment for diving accidents and complex medical emergencies alike.

What Is a Hyperbaric Chamber?

The unit operates a specialized chamber where patients breathe pure oxygen at pressures significantly higher than normal atmospheric levels.

• Pressure Capability: The chamber can reach approximately 6 bar (equivalent to a depth of 50 metres).

• The Process: By simulating the pressure found underwater, doctors can perform controlled recompression to treat:

  • Decompression Sickness (DCS): Commonly known as “the bends.”

  • Gas Embolism: Where air bubbles obstruct blood vessels.

  • Carbon Monoxide Poisoning: Rapidly flushing toxins from the blood.

  • Non-healing Wounds: Treating severe infections by enhancing the body’s natural healing environment.

Understanding "The Bends"

Decompression sickness occurs when a diver ascends too quickly. Under pressure, the body absorbs nitrogen; if that pressure is released too fast, the nitrogen forms bubbles in the bloodstream—similar to opening a fizzy drink too quickly. These bubbles can cause joint pain, dizziness, paralysis, or even death.

The hyperbaric chamber saves lives by physically shrinking these bubbles and allowing the nitrogen to dissolve safely back into the blood.

More Than Just Diving Injuries

While decompression sickness is the most well-known use, the chamber at the National Hyperbaric Medicine Unit treats a wide range of serious medical conditions.

It is commonly used for:

• Carbon monoxide poisoning – rapidly restoring oxygen levels and preventing brain damage

• Non-healing wounds – supporting tissue repair and helping prevent amputations

• Severe infections – slowing harmful bacteria and boosting the body’s immune response

• Gas embolism – shrinking dangerous air bubbles in the bloodstream

• Radiation injury – repairing tissue damage after cancer treatment

• Crush injuries and trauma – reducing swelling and improving oxygen supply to injured areas

Inside the chamber, patients breathe 100% oxygen under pressure, allowing the body to deliver significantly more oxygen to damaged tissue—accelerating healing and recovery.

Real-Life Impact in Irish Waters

This isn’t just theory. Divers across Ireland have been airlifted by the Coast Guard and brought directly to Galway for emergency care.

In a notable case reported by The Irish Times, four divers required treatment in Galway within a single week—three of whom were airlifted from Lough Derg. These incidents highlight that the risk of DCS applies to everyone, regardless of experience level or club affiliation. The presence of this facility in Galway provides a critical safety net, ensuring rapid access to treatment without the need to travel abroad.

Key Takeaways from the Visit

Beyond the technology, the biggest takeaway for our club members was awareness. Here is what every diver should keep in mind:

• Recognize Symptoms Early: In diving medicine, time is critical. The sooner treatment begins, the better the outcome.

• Respect Nitrogen Narcosis: Feeling “narced” or “drunk” at depth impairs judgment and reaction times. Discipline is your best defense.

• Ease Into the Season: After a winter break, start with shallower dives. Allow your body and mind to readjust to the pressure and equipment before pushing your limits.

• The Golden Rule: Dive within your limits. Build up slowly. Stay aware.

Final Thoughts

The Galway Hyperbaric Chamber is a remarkable facility where physics meets lifesaving medicine. For the diving community, it serves as a sobering reminder that beneath the adventure of the underwater world lies a need for respect, preparation, and safety.

If you are part of a diving club or interested in emergency medicine, I highly encourage learning more about hyperbaric treatment. When seconds count, knowledge is just as important as your equipment.

References: The Irish Times (2005) – Galway to get facility for treating the bends