YouDive educational guide · References checked 30 September 2026 · Independent instructor and medical review pending. This library does not provide certification, individual medical clearance or a dive plan.
Understand the risk
Trapped expanding gas can injure the lungs and may lead to arterial gas embolism. This is one reason scuba training emphasises continuous breathing and controlled ascents. A short or shallow dive is not exempt from pressure-related lung injury.
Lung overexpansion and breath-holding: what connects
Ascent
Gas expands
- Breathe continuously as trained
Buoyancy
Uncontrolled rise adds risk
- Practise control
After a dive
Chest or breathing symptoms
- Seek urgent help
Concept relationships from this lesson. These are discussion points, not a dive profile or emergency treatment sequence. Read the cited sources; qualified review is pending.
Put the knowledge into practice
Never deliberately hold your breath while ascending on scuba. Practise buoyancy and ascent control with supervision. A history of lung disease or new respiratory symptoms belongs in a diving-medical discussion before further diving.
What to notice and discuss
| Consider | Why it matters | Planning or learning response |
|---|---|---|
| Ascent | Gas expands | Breathe continuously as trained |
| Buoyancy | Uncontrolled rise adds risk | Practise control |
| After a dive | Chest or breathing symptoms | Seek urgent help |
PAUSE & THINK
What would you do?
A diver holds a full breath to float upwards for a photograph.
Reveal the discussion answer
Stop treating breath-holding as a buoyancy shortcut. Review correct buoyancy control with an instructor.
Frequently asked questions
Can a lung injury happen close to the surface?
Yes. Significant relative pressure changes occur in shallow water. Shallow does not mean pressure-free.
Sources & further reading
DAN: Back to basics — diving injuries ↗DAN: The importance of buoyancy control ↗These sources inform this guide; their organisations have not reviewed or endorsed YouDive.
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