Hyperbaric and Diving Decompression Chambers Explained

Decompression sickness, the condition divers call “the bends,” happens when you come up too fast and dissolved nitrogen forms bubbles in your blood and tissues. The established treatment is recompression in a hyperbaric chamber, where raised pressure shrinks the bubbles and oxygen helps clear them. This is one of hyperbaric therapy’s oldest, most proven uses, and it is exactly the kind of thing these chambers were built for.

Of everything hyperbaric chambers do, treating diving injuries is among the most established and well understood. Here is a clear, friendly explainer of what decompression sickness is, how recompression works, why this differs from gentle wellness use, and what every diver should know.

What is decompression sickness?

When you dive, your body absorbs nitrogen under pressure. Come up too quickly and that nitrogen escapes as bubbles, a bit like opening a fizzy drink, and those bubbles can cause anything from joint pain to more serious effects. A related issue, arterial gas embolism, involves gas getting into the circulation. Both are diving emergencies that need prompt care, which is why ascent rates and decompression stops are taken so seriously.

How chambers treat it

The treatment is called recompression: you enter a hyperbaric chamber, the pressure is raised to squeeze the nitrogen bubbles back into solution, and you breathe high-concentration oxygen to help clear the nitrogen out. The pressure is then lowered gradually along an established treatment table. It is delivered by trained hyperbaric teams using protocols refined over decades. 

Step	What happens
Recompression	Pressure raised to shrink bubbles
Oxygen breathing	High-concentration oxygen clears nitrogen
Controlled ascent	Pressure lowered along a treatment table

How this differs from wellness use

This is worth being clear about. Treating the bends is an emergency, FDA-cleared use carried out at clinical pressures with trained supervision. A gentle home wellness chamber is a different thing entirely and is not a stand-in for emergency recompression. The two share the word “hyperbaric,” but one is an emergency medical treatment and the other is everyday wellness equipment, so if you ever suspect decompression sickness, head for professional emergency care rather than a home device.

What every diver should know

Prevention is the real hero here. Follow safe ascent rates, dive within your limits, and plan your decompression stops, and you dramatically lower your risk in the first place. If you do suspect decompression sickness, treat it as an emergency: get professional help straight away, give oxygen if you are trained to, and reach a recompression facility as fast as you can, because earlier treatment means better outcomes. When you dive somewhere remote, it is smart to know where the nearest facility is and to have an emergency plan with your group.

A little history

Recompression therapy has a long and reassuring track record. The basic principle, raising pressure to manage the effects of coming up too fast, has been understood and refined for well over a century, originally in the context of tunnel and bridge workers who faced the same pressure changes as divers. Today’s treatment tables are the product of decades of careful practice and refinement, which is exactly why this is one of the most established uses of hyperbaric medicine. Knowing that depth of experience sits behind it is genuinely reassuring, and it is a reminder that hyperbaric chambers have a serious, well-proven heritage.

Why divers value knowing this

Even if you never need recompression, understanding how it works makes you a more confident, better-prepared diver. It reinforces why ascent rates and decompression stops matter, helps you recognize symptoms early, and means you will know to act quickly rather than wait if something feels off. That awareness, more than anything, is what keeps diving the safe, enjoyable pursuit it should be.

FAQs

Is HBOT the treatment for decompression sickness?

Yes. Decompression sickness is one of the conditions hyperbaric chambers are FDA-cleared for, and recompression is the established treatment.

Can a home hyperbaric chamber treat the bends?

No. The bends is a medical emergency that needs clinical recompression with trained supervision. A gentle home wellness chamber is not a substitute, so always seek emergency care.

How quickly should it be treated?

As soon as possible. It is time-sensitive, and earlier recompression generally means better outcomes, so treat any suspected case as an emergency.

How do you prevent it?

Safe ascent rates, diving within your limits, planning decompression stops, and good training. Prevention does far more than relying on treatment after the fact.