SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/scout-hyperventilation-underwater

Why is it dangerous to breathe fast and deep on purpose before holding your breath underwater?

You can pass out before you feel the need to breathe.

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  1. It may delay breathing signals until you pass out ✔
  2. It raises carbon dioxide until you pass out
  3. It uses up all oxygen before you enter the water

Why: Deliberate hyperventilation can make you faint from lack of oxygen before your body tells you to breathe. Underwater, that can lead to drowning.

Huh, didn't know that: Because of this risk, competitive underwater swimming events are not allowed in Scouting.

The dad joke
Why did the fish refuse to hold its breath? It didn't see the point.
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References

Answer: It may delay breathing signals until you pass out. Deliberate hyperventilation can make you faint from lack of oxygen before your body tells you to breathe. Underwater, that can lead to drowning.

  1. First Aid merit badge pamphlet filestore.scouting.org/filestore/Merit_Badge_ReqandRes/Pamphlets/First%20Aid.pdf
    A person who does this can pass out or faint from lack of oxygen before feeling the need to breathe.
    Checked 2026-10-09.

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